Access Doors - METU- · PDF file58 METU-SYSTEM Catalog 6b Access Doors General Characteristics Overview Our standard access doors have a few common characteristics which have been

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METU-SYSTEM Catalog 6b

Access Doors

Access Door General Characteristics

RD Access Doors

GX Access Doors

LX Access Doors

RRD Access Doors for Round Ducts

IRD Insulated Access Doors for Rectangular Ducts

Special: IRD-3PL Insulated Access Doors for Rectangular Ducts

Special: IRD-3DE Insulated Access Doors for Rectangular Ducts

Special: IRD-DW1 Insulated Access Doors for Rectangular Ducts

Special: IRD-DW2 Insulated Access Doors for Rectangular Ducts

Special: IRRD-3PL Insulated Access Doors for Round Ducts

Special: IRRD-3DE Insulated Access Doors for Round Ducts

Special: IRRD-DW1 Insulated Access Doors for Round Ducts

Special: IRRD-DW2 Insulated Access Doors for Round Ducts

Special Access Doors Questionnaire

58 METU-SYSTEM Catalog 6b

Access Doors General Characteristics

Overview

Our standard access doors have a few common characteristics which have been gathered in this section to avoid unnecessary redundancies.

Should you not be able to find the specific access door corresponding to your needs, please do not hesitate to contact us. Chances are that we might be able to find an adequate solution.

Air Tightness

The “TÜV NORD” certificate confirms that the air-tightness of the METU RD and GX access doors is far lower than the admissible leakage of the highest tightness class D according to DIN EN 1507, assuming the Access Doors have been properly installed according to our instructions.It is especially important that:- the knobs are sufficiently tightened (F > 500 N)- the access doors are installed on smooth and clean surfaces

Liquid Tightness

Standard access doors fitted with a polyethylene (PE)gasket have a limited liquid tightness (they are considered splash-tight).

Superior liquid tightness can be achieved using access doors fitted with a rubber edge molding (SKK), assuming it has been cut and installed properly (please refer to the Original Löwe 3101 scissors, Art. No. G04V-1005).

Liquid and even oil-tightness can be achieved with the GX access doors fitted with NBR gaskets. Pre-requisites to the above are the absence of joints and/or seams crossing the access door opening and an installation in accordance with our instructions. The GX access doors are only available for rectangular ducts.

Safety / Retaining Cable

For additional security (DIN EN 12097, 2006, 4.2.2) a retaining cable (Art. No. D01V-2001) can be fitted on practically all access doors.

Outdoor Exposure

Should the access doors be installed outside the building, the following points should be taken into consideration:

- Install the access doors in the least exposed areas.

- Install the access doors in areas where rain water cannot accumulate (not on top of rectangular ducts for example).

- The knobs made of POM will not corrode, but may discolor and become brittle over time. Metal knobs are therefore recommended, although the risk of corrosion is more important.

- Make sure you choose the appropriate gasket, such as the self-adhesive rubber edge molding (SKK) which has higher UV and ozone resistances.

- Finally, galvanized access doors can also be ordered with a thicker zinc coating (275 g/m2) upon request. Minimum order quantities and longer lead times must be expected.

Versions in Stainless Steel V4A

The access door cover plates are made of stainless steel V4A (1.4571, or ASTM 316Ti). The bolts, springs, nuts and eventual metal knobs are made of stainless steel V2A (1.4301, ASTM 304).

Versions in Aluminum

The access door cover plates are made of aluminum. The bolts, springs, nuts and eventual metal knobs are made of stainless steel V2A (1.4301, ASTM 304).

Versions with Rubber Edge Molding (SKK)

The rubber edge molding is wrapped along the opening and brings the following advantages:

It protects against injuries (usually cuts) or damage to the cleaning equipment.

It provides better tightness properties as smaller irregularities along the opening are covered.

Special Versions

We are usually able to propose special access door versions fulfilling your specific requirements.

In view of the numerous execution possibilities, we recommend you first order one piece in order to test it, as special product versions can neither be returned nor refunded.

Equipotential Bonding

Should an equipotential bonding be required, we recommend the use of access doors fitted with a retaining cable and metal knobs, as these allow a metal-to-metal contact between all access door parts and the duct.

59METU-SYSTEM Catalog 6b


Maximum Duct Wall Thickness

For standard access doors with polyethylene, ceramic wool or silicon gaskets, the maximum duct wall thickness is 5 mm.

For thicker duct wall thickness special access door versions (with longer bolts) must be ordered.

Access doors with rubber edge molding (SKK) can be installed on duct walls having a maximum thickness of 2 mm.

Air-flow Resistances

The METU access doors can be divided, as far as the resistances to the airflow are concerned, into three groups:

1. RD and RRD Access Doors (Standard)

2. Access Doors with a 3rd Cover (3PL)

3. GX and LX Access Doors

Due to friction, the air-flow velocity near the duct wall is practically nil.

The results of our air-flow resistance tests are the following:

- All three groups have relatively low air-flow resistance values which roughly correspond an additional ductwork length of 200 to 400 mm.

- The differences between the three groups are small.

- The access doors with a 3rd cover (3PL) show the lowest air-flow resistances, followed by the RD and RRD standard access doors.

- The GX and LX access doors offer the highest resistances, as their bulging inner-surfaces enter deeper into the air-flow. At the same time they offer better aerodynamic characteristics which reduce turbulences as well as the deposit and accumulation of dust and dirt.

Installation Clearances

The following clearances must be observed on rectangular ducts:

There are no such limitations with circular ducts, as the range of access doors has been determined in such a way that opening size and duct diameter combination will not weaken the circular duct unduly.

Creating the Opening Beforehand

The opening is normally made using the self-adhesive template coming with the access door. The following dimensions can be used to create the opening without the template:

Type Opening B H R

RD 18 (180 × 80 mm) 180 80 40RD 21 (200 × 100 mm) 200 100 50RD 315 (300 × 150 mm) 300 150 75RD 32 (300 × 200 mm) 300 200 100RD 42 (400 × 200 mm) 400 200 100RD 43 (400 × 300 mm) 400 300 150RD 53 (500 × 300 mm) 500 300 150RD 54 (500 × 400 mm) 500 400 200RD 64 (600 × 400 mm) 600 400 200RD 65 (600 × 500 mm) 600 500 250RD 75 (700 × 500 mm) 700 500 250

These dimensions are also valid for the GX and LX access door templates.

Type Opening B H R

RRD 18 (180 × 75 mm) 182 76 38RRD 21 (200 × 97 mm) 200 97 48,5RRD 32 (300 × 195 mm) 298 194 97RRD 43 (400 × 290 mm) 400 290 145RRD 54 (500 × 390 mm) 496 390 195

The RRD opening dimensions refer to the template when lying on a flat surface.

We do not recommend creating the opening beforehand when special access door versions have been ordered.

A = min. 50 mmB = min. 50 mmC = min. 15 mm D = min. 15 mm

All figures in mm

A

B

C

D

B

H R



Standard Knobs

The ergonomic design of our knobs allows a comfortable handling and an accrued clamping power.

Safety is also taken into consideration as they prevent the bolts from protruding.

The corrosion resistant material of the POM knobs guarantee years of trouble-free operation.

Detailed material specifications can be found in the Additional Information ZI-301.

The above information are also valid for the other access door types.

Metal Knobs

Are commonly used:

- with higher operating temperatures,- when installed outside buildings,- when specific chemical resistances are required,- with some special insulated access doors with a thinner insulation,- with some access doors fitted with a lock.

Access Door Material Knob Material

Galvanized Steel Galvanized SteelStainless Steel V2A Stainless Steel V2AStainless Steel V4A Stainless Steel V2AAluminum Stainless Steel V2A

Knob Torques

Attempt to quantify the maximum clamping force of the access door knobs:

After tightening the knobs as much as possible manually, the torque is read on a dynamometric wrench:

M8 Knob Applicable Torque 1.000 - 1.500 NM10 Knob Applicable Torque 1.200 - 1.700 NM12 Knob Applicable Torque 2.000 - 3.000 N

Daylights / Clearances

Clearance between the duct wall and the upper edge of the knob or lever in closed position: Type Opening Knob

RD 18 (180 × 80 mm) M8RD 21 (200 × 100 mm) M8

RD 315 (300 × 150 mm) M10RD 32 (300 × 200 mm) M10RD 42 (400 × 200 mm) M10RD 43 (400 × 300 mm) M10RD 53 (500 × 300 mm) M10

RD 54 (500 × 400 mm) M12RD 64 (600 × 400 mm) M12RD 65 (600 × 500 mm) M12RD 75 (700 × 500 mm) M12

RD Access Door

RD 18 ≈ 37 mmRD 21 ≈ 35 mmRD 315 ≈ 50 mmRD 32 ≈ 50 mmRD 42 ≈ 50 mmRD 43 ≈ 56 mmRD 53 ≈ 56 mmRD 54 ≈ 67 mmRD 64 ≈ 67 mmRD 65 ≈ 73 mmRD 75 ≈ 73 mm

GX Access Door

GX 21 ≈ 20 mmGX 32 ≈ 20 mmGX 43 ≈ 15 mm

LX Access Door

LX 32 ≈ 20 mmLX 43 ≈ 15 mm

Metal knobs have usually the same clearances, since the same bolt length is required for opening or closing the access door.

RRD Access Door

RRD 18 ≈ 36 mmRRD 21 ≈ 40 mmRRD 32 ≈ 55 mmRRD 43 ≈ 60 mmRRD 54 ≈ 70 mm


• For rectangular ducts

• Eleven (11) opening sizes!

• In galvanized steel (150 and 275 upon request), stainless steel (304 and 316Ti) and aluminum

depending on the types and dimensions.

• The thin and sometimes wavy duct-wall is clamped between two stable covers

• Two knobs allow a comfortable handling and operation of the

access door.

Press formed, strong and attractive in appearance, the covers are available in galvanized steel, stainless steel and aluminum

Ergonomic and corrosion resistant POM knobs. Their design prevents the bolts from protruding

Locking nuts prevent the knobs from being totally removed For safety reasons and

to prevent the loss of the door, retaining cables are available with M6 bolt and nut (Art. No. D01V-2001)

Galvanized or stainless steel springs

Galvanized or stainless steelcup square bolts with gasket ring

Standard version withpolyethylene (PE) gasket

Access Doors RD


RD Versions

Standard Version:

With Polyethylene (PE) Gasket and POM Knobs

Operating Temperature: max. +70°C

Polyethylene specifications: Additional Information ZI-201 Knobs specifications: Additional Information ZI-301 Material specifications: Additional Information ZI-101

Version with Self-Adhesive Rubber Edge Molding:(it is wrapped along the edges of the duct opening, serves as gasket and prevents injuries)

With Rubber Edge Molding (SKK) and POM knobs


SKK specifications: Additional Information ZI-204

Version for higher Temperatures:

With Vitreous Fiber Gasket (KF) and Metal knobs (HT)

Operating Temp.: Galv. steel version max. +200°C Stainless V2A version max. +300°C

Vitreous fiber specifications: Additional Information ZI-206 Material specifications: Additional Information ZI-101

Notice: The glue holding the vitreous fibers might be destroyed above 200°C. We therefore recommend to replace the gasket after each opening of the access door.

Higher resistances to abrasion and better aerodynamic properties are achieved with the access door fitted with a 3rd plate (3PL) spot welded onto the inner access door cover plate. Since this 3rd plate also insulates the access door, these access door versions are also described in the „Insulated Access Doors IRD-3PL“ rubric.

Access Doors RD

Version for the Food Industry:

With Silicon Gasket and POM Knobs


Silicon specifications: Additional Information ZI-211

Version for the Food Industry and higher Temperatures:

With Silicon Gasket and Metal Knobs (HT)

Operating Temperature: max. +200°C Silicon specifications: Additional Information ZI-211

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Installation Instructions

Apply the self-adhesive template on the duct wall at the desired position

Cut the opening following the edge of the template

The SKK molding is fitted with injected glue. It can be applied on duct walls up to 2 mm thick (Gauge ≈14)

The thicker lip of the SKK must be inside the duct

Apply the SKK molding so that the duct wall enters as deeply as possible into the pocket. Both ends should meet at a straight section, pressing slightly against each other but without overlap-ping. To cut the insulation properly we recommend the use of the Original Loewe Scissors (Art. No. G04V-1005)

Turn the knobs till they hit the stops and insert the inner door panel inside the opening at an angle.

Then straighten the door, pull it lightly to center it and tighten the knobs.

Access Doors RD

For access doors ordered with SKK rubber edge molding


• For rectangular ducts• The bolts do not stick out, thus

avoiding dangerous protrusions.• Ideal when space is restricted, or when the door shouldn´t stick out for security reasons (in garages for example)• The groove on the outer cover

facilitates the positioning of the access door into the opening

• Oil-tight version available (with NBR seals)

• Available in three sizes: 200 x 100 mm 300 x 200 mm 400 x 300 mm

International

Patents

The door sits deeper into the duct, making it more discrete and eliminating dangerous protrusions (safety aspect)

Ergonomic and corrosion resis-tant POM knobs. Their design prevents the bolts from protruding

The groove on the outer cover facilitates the positioning of the access door into the opening

The aerodynamic characteristics limit turbulences and the deposit and accumulation of dust and dirt


Access Doors GX


GX Versions

Access Doors GX

Standard Version:





With Rubber Edge Molding (SKK) and POM knobs




With Vitreous Fibers Gasket (KF) and Metal knobs (HT)

Operating Temp.: max. +200°C

Vitreous fibers specifications: Additional Information ZI-206 Material specifications: Additional Information ZI-101









Oil-tight Version:

With NBR gasket and POM knobsOperating Temperature: max. +80°C

NBR specifications: Additional Information ZI-210. Air-tightness: better than the highest class D (DIN EN 12237)

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Access Doors GX







For access doors ordered with SKK rubber edge molding:


• Time-saving access door version for rectangular ducts• Two levers allow the opening or the closing of the access door within seconds• The bolts do not stick out, thus

avoiding dangerous protrusions• Ideal when space is restricted, or when the door should not

stick out for security reasons (in garages for example)• The groove on the outer cover

facilitates the positioning of the access door into the opening

• Security locks prevent an accidental opening• Available in two sizes: 300 x 200 mm 400 x 300 mm

International

Patents

Comfortable POM levers for avery quick and timesaving operation

Security-locks mounted on each lever allow to lock them in the closed position

The groove on the outer cover facilitates the positioning of the access door into the opening

Once the levers are closed any dangerous protrusions are eliminated


The aerodynamic characteristics limit turbulances and the deposit and accumulation of dust and dirt.

The pressureexerted by thelevers can beadjusted byrotating them

Lever location anddimensions changeaccording to doordimensions

Access Doors LX


Access Doors LX

LX Versions

Version:

With Polyethylene (PE) Gasket and Levers


Polyethylene specifications: Additional Information ZI-201 Lever specifications: Additional Information ZI-301 Material specifications: Additional Information ZI-101


With Rubber Edge Molding (SKK) and Levers




With Silicon Gasket and Levers



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Door installation: Open both levers and insert the inner door panel inside the opening at an angle. Then straighten the door and push it lightly against the duct wall: it will automatically position itself correctly. Close levers simultaneously until they lock. If the levers can be closed too easily (the gasket is not squeezed enough), open the levers and turn them once 360° clockwise.If, on the contrary, the levers close too heavily (they do not lock completely), open the levers and turn them once 360° counter-clockwise. Then switch both security locks (refer to picture 5) into the „locked“ position to avoid any accidental opening.

Access Doors LX







For access doors ordered with SKK rubber edge molding


• For round ducts

• Available in five sizes 180 x 80 mm 200 x 100 mm 300 x 200 mm 400 x 300 mm 500 x 400 mm

• For duct-Ø 68 to 1800 mm (not all opening dimensions)

• In galvanized steel, stainless steel and aluminum

• The duct wall is clamped between two stable covers

• Two knobs allow a comfortable handling and operation of the

access door

Press formed, strong and attractive in appearance, the covers areavailable in galv. steel, stainlesssteel and aluminum


Locking nuts prevent the knobs from being totally removed

For safety reasons and to prevent the loss of the door, retaining cables are available with M6 bolt and nut (Art.No. D01V-2001)


Galvanized or stainless steelcup square bolts with gasket ring


Access Doors RRD


Access Doors RRD

RRD Versions

Standard Version:




Version with Self-Adhesive Rubber Edge Molding:

With Rubber Edge Molding (SKK) and POM knobsOperating Temperature: max. +80°C SKK specifications: Additional Information ZI-204

The self-adhesive rubber edge molding is wrapped along the edges of the duct opening, serves as gasket and prevents injuries.


With Vitreous Fibers (KF) Gasket and Metal knobs (HT)

Operating Temp.: Galv. steel version max. +200°C Stainless V2A version max. +300°C

Vitreous fibers specifications: Additional Information ZI-206 Material specifications: Additional Information ZI-101









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1800 mm Ø

1600 mm Ø

1500 mm Ø

1400 mm Ø

1300 mm Ø

1200 mm Ø

1100 mm Ø

1000 mm Ø

900 mm Ø

800 mm Ø

600 mm Ø

500 mm Ø

700 mm Ø

400 mm Ø

200 mm Ø

100 mm Ø

68 mm Ø


Access Doors RRD

RRD Opening Dimensions According to Duct Diameters

RRD 18Opening size 180 x 80 mmfor 68 to 170 mm duct diameters





Access door dimensions also available for larger duct-Ø as special versions

upon request

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Access Doors RRD









For access doors ordered with SKK rubber edge molding:


• For insulated rectangular ducts - outside insulation - inside insulation (not for all opening sizes)

• For 20 to 55 mm insulation thicknesses

• The cut edge of the insulation is protected by a cover plate

• The cover plate is maintained in place and connected to the duct without generating thermal bridges thanks to a special

rubber profile

• The air pocket between the outer and inner plates provide an

adequate thermal insulation

Locking nuts prevent the knobs from being

totally removed


Cover plate protecting the cut edge of the insulation and preventing the shedding of loose fibers while esthetically pleasing

Press formed, strong and attractive in appearance, the covers are available in galvanized steel, stainless steel and aluminum

Insulation

The air pocket between the outer and inner plates provides a good

thermal insulation

Duct wall

Special rubber profile holding the cover plate to the duct while providing a thermal break


Galvanized or stainless steel cup square bolts with gasket rings

Insulated Access Doors IRD

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IRD Versions

Insulated Access Door IRD-2

For insulation thicknesses from 20 to 30 mm(≈ 0,79 to 1,18 in). The insulation must be soft.

Operating temperature: max. +80°C (176°F)Duct wall thickness: max. 2,0 mm

Clearance = 19 mm

Clearance = 29 mm

Clearance = 39 mm

7 mm

7 mm







Insulation inside the Duct

The above information are also valid when the insulation is inside the duct. If the duct is not installed yet, all eleven IRD dimensions can be installed, assuming that the duct is large enough (see general access door characteristics). If the duct is already installed, and because the cover plates cannot be inserted in all openings, only the following access door sizes can be installed: IRD 42, 53, 64 and 75.


Additional Insulating Measures

In order to limit eventual convection currents in the air-pockets, insulation chunks (which has been removed to install the access door) can be stuffed between the duct wall and the cover plate (1) and/or between the access door covers (2).

15 mm

IRD rubber profile specifications: Additional Information ZI-209Knobs specifications: Additional Information ZI-301

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5 6

7 8

27 mm

60 mm

87 mm

10 mm



Cut the insulation according to the depicted information

If the insulation is relatively dense, the cut edge should be tapered approximately 10 mm

To cut the insulation use the cover plate as a template and mark

around the outer edge. Then cut out the insulation approximately 20 mm (0,79 in) inside the mark

Use the cover plate to make the duct opening by marking around the inner edge and cutting carefully following this mark

The cover plate is secured by a rubber profile. Begin fitting at a straight section, the duct wall in

one groove of the rubber and the cover plate in the other

The rubber profile is supplied at the correct length for each door size. Join the rubber ends as illustrated, and push them into place

To install the Access Door unscrew both knobs fully and,

using both hands, place the door in the opening at an angle

Then turn it straight and pull it slightly out to align. Finish by tightening the knobs

All Insulated Access Door sizes can be used on outside insulated

ductwork. However, for inside insulated ductwork, only the

following Insulated Access Door sizes can be installed:

IRD 42, IRD 53, IRD 64 and IRD 75

Cover Plate

Duct wall

Cut edge alined

Insulation



• For rectangular ducts with outside or inside insulation• For insulation thicknesses above 55 mm• This access door is actually a standard RD fitted with a 3rd plate (3PL) which has been spot welded onto the inner cover plate, creating a hollow space filled with insulation.• Aerodynamic: the smooth inner surface created by the 3rd plate offers the least resistance to the air-flow.• Abrasion resistance: the 3rd plate can also be made of a thicker material gauge in order to resist the rapid

wearing created by the transport of grinding dusts or wood shavings for example. • The insulating properties are inferior to those of the IRD access doors, as thermal bridges can occur on

some areas (A).

The cut edges of the insulation should be covered (i.e. with an aluminum tape) in order to avoid chunks flying away. This should especially be done when the insulation is inside the duct, in order to avoid contaminating the air inside the ventilation system.

SPECIAL: Insulated Access Doors IRD-3PL

Standard Version:




With Rubber Edge Molding (SKK) and POM Knobs


Version for higher Temperatures (HT):

With Vitreous Fibers Gasket (KF) and Metal Knobs

Operating Temp.: Galv. steel: max. +200°C Stainless V2A: max. +300°C Notice: The glue holding the vitreous fibers might be destroyed above 200°C. We therefore recommend to replace the gasket after each opening of the access door.





With Silicon Gasket and Metal Knobs


A


• For rectangular ducts with outside insulation (not suitable for ducts with inside insulation)• Designed for thicker insulations, depending on the access door dimensions (please refer to the table below).• The IRD-3DE is characterized by a 3rd, larger cover plate which is placed on top of the insulation outside the

duct and minimizes any thermal bridges.• The cut edge of the insulation is covered by the larger cover plate and offers a pleasing appearance.• The air pocket trapped between the 3rd cover plate ad the access door provides good insulating properties.

The 3rd cover plate should only apply a light pressure on the soft insulating material: the knobs must therefore be tightened lightly

SPECIAL: Insulated Access Doors IRD-3DE

Standard Version:

With Polyethylene (PE) Gasket and POM Knobs (*)



With Rubber Edge Molding (SKK) and POM Knobs (*)



With Vitreous Fibers (KF) Gasket and Metal Knobs (*)

Operating Temp.: Galv. steel: max. +200°C Stainless V2A: max. +300°C Notice: The glue holding the vitreous fibers might be destroyed above 200°C. We therefore recommend to replace the gasket after each opening of the access door


With Silicon Gasket and POM Knobs (*)



With Silicon Gasket and Metal Knobs (*)


The inside covers guarantee the air-tightness of the access door. Knobs must be fastened securely

Minimum Insulation Thicknesses

Approximative valuesIRD-3DE 21: 42 mmIRD-3DE 32: 55 mmIRD-3DE 42: 55 mmIRD-3DE 43: 60 mmIRD-3DE 53: 60 mmIRD-3DE 54: 75 mmIRD-3DE 64: 75 mmIRD-3DE 65: 80 mmIRD-3DE 75: 80 mm

These values corre-spond to the bolt height plus approx. 5 mm, as the insulation is usually soft and can be slightly compressed by the 3rd cover.

(*)Using metal knobs would reduce the minimum insulation thickness by about 20 mm.

In order to avoid any convection currents, insulation chunks can be stuffed into the hollow spaces of the access door


• For double-wall rectangular ducts and ducts made of sandwich-type pre-insulated duct panels covered on both sides with an aluminum foil.• For insulation thicknesses from 10 to 60 mm. There are maximum insulation thicknesses to be taken into consideration depending on the access door dimensions (please refer to the table below).• The IRD-DW1 is a standard RD access doors with longer bolts.• The insulation between the ducts must be hard enough in order to resist the pressure exerted by the access door. Should that not be the case, the ducts might be deformed and the air-tightness of the access door might not reach the DIN EN 12237 class C.

Knobs must be fastened securely.

SPECIAL: Insulated Access Doors IRD-DW1

Standard Version:







With Vitreous Fibers (KF) Gasket and Metal Knobs








Maximum Insulation Thicknesses

Approximative valuesIRD-DW1 18: 20 mmIRD-DW1 21: 30 mmIRD-DW1 315: 30 mmIRD-DW1 32: 30 mmIRD-DW1 42: 40 mmIRD-DW1 43: 40 mmIRD-DW1 53: 50 mmIRD-DW1 54: 50 mmIRD-DW1 64: 60 mmIRD-DW1 65: 60 mmIRD-DW1 75: 60 mm

In order to avoid any convection cur-rents, insulation chunks can be stuffed into the hollow spaces of the access door.


• For double-wall rectangular ducts.• For thicker insulations; depending on the access door sizes there are minimum insulation thicknesses to be taken into consideration.• This solution is made of two separate RD access doors.• Since this solution consists of two independent access doors, they can be selected in accordance with the specifications and requirements of each duct (see example below).• This solution provides optimal insulation properties, as there are no thermal bridges and a large air-pocket trapped between the access doors.

SPECIAL: Insulated Access Doors IRD-DW2-Solution

Example:

Outer Duct: RD Access Door Material: galvanized steel with polyethylene (PE) gasket and POM knobs.Operating temperature: max. +70°CInner Duct for higher temperatures and hygiene requirements: RD HT V2A Access Doormade of stainless steel (V2A) with silicon gasket and stainless steel knobs (V2A).Operating temperature: max. +200°C

There are numerous combination possibilities.

When choosing the access door dimensions, the minimum insulation thickness must be taken into account.

Different opening dimensions can also be combined. Usually smaller openings are made on the inner duct, and larger ones on the outer duct to improve accessibility.

Should you need any help to decide which door would be the most suitable, please do not hesitate to contact us.


Approximative valuesIRD-DW2 18: 42 mmIRD-DW2 21: 42 mmIRD-DW2 315: 55 mmIRD-DW2 32: 55 mmIRD-DW2 42: 55 mmIRD-DW2 43: 60 mmIRD-DW2 53: 60 mmIRD-DW2 54: 75 mmIRD-DW2 64: 75 mmIRD-DW2 65: 80 mmIRD-DW2 75: 80 mm

The above indications correspond to the combination of two access doors having the same opening dimensions. Choosing access doors with different opening dimensions might somewhat reduce the a.m. values.

In order to avoid any convection currents, insulation chunks can be stuffed into the hollow spaces of the access door


• For circular ducts with outside or inside insulation• Suitable for all insulation thicknesses• This access door is actually a standard RRD fitted with a 3rd plate (3PL) which has been spot welded onto the inner cover plate, creating a hollow space filled with insulation.• Aerodynamic: the smooth inner surface created by the 3rd plate offers the least resistance to the air-flow.• Abrasion resistance: the 3rd plate can also be made of a thicker material gauge in order to resist the rapid

wearing created by the transport of grinding dusts or wood shavings for example.

SPECIAL: Insulated Access Doors IRRD-3PL

Standard Version:















The cut edges of the insulation should be covered (i.e. with an aluminum tape) in order to avoid chunks flying away. This should especially be done when the insulation is inside the duct, in order to avoid contaminating the air. A


• For circular ducts with outside insulation (not suitable for round ducts with inside insulation)• Minimum insulation thicknesses apply depending on the access door dimensions (please refer to the table

below).• The IRRD-3DE is characterized by a 3rd, larger cover plate which is placed on top of the insulation outside

the duct and minimizes any thermal bridges.• The cut edge of the insulation is covered by the larger cover plate and offers a pleasing appearance.• The air pocket trapped between the 3rd cover plate and the access door provides good insulating properties

The 3rd cover plate should only apply a light pressure on the soft insulating

material: the knobs must therefore be tightened lightly.

SPECIAL: Insulated Access Doors IRRD-3DE

Standard Version:

With Polyethylene (PE) Gasket and POM Knobs (*)


Version with Self-Adhesive Rubber Edge Molding::With Rubber Edge Molding (SKK) and POM Knobs (*)



With Vitreous Fibers (KF) Gasket and POM Knobs outside, Metal Knobs inside (*)

Operating Temp.: Galv. steel: max. 200°C Stainless V2A: max. +300°C Notice: The glue holding the vitreous fibers might be destroyed above 200°C. We therefore recommend to replace the gasket after each opening of the access door


With Silicon Gasket and POM Knobs outside, Metal Knobs inside (*)


The inside covers guarantee the air-tightness of the access door. Knobs must be fastened securely.


Approximative valuesIRRD-3DE 18: 42 mmIRRD-3DE 21: 45 mmIRRD-3DE 32: 60 mmIRRD-3DE 43: 65 mm

These values cor-respond to the bolt height plus ≈5 mm, as the insulation is usually soft and can be slightly compressed by the 3rd cover.

(*)Using metal knobs would reduce the minimum insulation thickness by about 20 mm.

In order to avoid any convection currents, insulation chunks can be stuffed into the hollow spaces of the access door.


• For double-wall circular ducts.• For insulation thicknesses from 10 to 50 mm. There are maximum insulation thicknesses to be taken into consideration depending on the access door dimensions (please refer to the table below).• The IRRD-DW1 is a standard RRD access doors with longer bolts.• The insulation between the ducts must be hard enough in order to resist the pressure exerted by the access door. Should that not be the case, the ducts might be deformed and the air-tightness of the access door might not reach the DIN EN 12237 class C.

Knobs must be fastened securely.

SPECIAL: Insulated Access Doors IRRD-DW1

Standard Version:



Version with Self-Adhesive Rubber Edge Molding::With Rubber Edge Molding (SKK) and POM Knobs











Maximum Insulation Thicknesses

Approximative valuesIRRD-DW1 18: 20 mmIRRD-DW1 21: 30 mmIRRD-DW1 32: 30 mmIRRD-DW1 43: 40 mm Higher Thicknesses are eventually possib-le, but the installation of the door will be difficult.



• For double-wall circular ducts.• For thicker insulations; depending on the access door sizes there are minimum insulation thicknesses to be taken into consideration.• This solution is made of two separate RRD access doors.• Since this solution consists of two independent access doors, they can be selected in accordance with the specifications and requirements of each duct (see example).• This solution provides optimal insulation properties, as there are no thermal bridges and a large air-pocket trapped between the access doors.

SPECIAL: Insulated Access Doors IRRD-DW2-Solution

Example:

Outer Duct: RRD Access Door made of galvanized steel with polyethylene (PE) gasket and POM knobs.Operating temperature: max. +70°CInner Duct for higher temperatures and hygiene requirements: RRD HT V2A Access Doormade of stainless steel (V2A) with silicon gasket and stainless steel knobs (V2A).Operating temperature: max. +200°C

There are numerous combination possibilities. When choosing the access door dimensions, the minimum insulation thickness must be taken into account.Different opening dimensions can also be combined. Usually smaller openings are made on the inner duct, and larger ones on the outer duct to improve accessibility.

Should you need any help to decide which door would be the most suitable, please do not hesitate to contact us.


Approximative valuesIRRD-DW2 18: 42 mmIRRD-DW2 21: 42 mmIRRD-DW2 32: 55 mmIRRD-DW2 43: 60 mmIRRD-DW2 54: 75 mm

The above indications correspond to the com-bination of two access doors having the same opening dimensions.

Choosing access doors with different opening dimensions might somewhat reduce the above mentioned values.



If you haven´t found the information for your requirements in this catalog and you need assistance with your access door choice, thank you for answering the questions below and for sending this questionnaire back to:

Fax No.: 0049 (0)7461 9287 28 or E-mail address: [email protected]

From: Company Name: Client No.

Contact:

Phone: E-mail:

QUESTIONNAIRE FOR SPECIAL ACCESS DOORS

Rectangular Ductwork dimensions: width _______ mm x height ________ mm x length ________ mm

rectangular, without insulation

rectangular with outside insulation insulation thickness: _______ mm

rectangular with inside insulation insulation thickness: _______ mm

rectangular double wall insulation thickness: _______ mm

Circular Ductwork

circular without insulation duct-Ø _________ mm

circular with outside insulation

circular double wall

outer Ø _______ mm / inner Ø _______ mm

insulation thickness: _______ mm

outer Ø _______ mm / inner Ø _______ mm

insulation thickness: _______ mm

Other indications and requirements

Required opening size: __________ x __________ mm Required quantity: _________ pieces

Operating temperature: _______ °C

Ductwork material (galv.,aluminium, stainless 304 or 316Ti):

Insulation Material (soft, hard, covered with aluminium foil):

Other requirements / remarks:

Special Access Doors Questionnaire

Documents

Access Doors - METU- · PDF file58 METU-SYSTEM Catalog 6b Access Doors General Characteristics Overview Our standard access doors have a few common characteristics which have been