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Ausgabe 12/10
GmbH Lufttechnik Dresden
USER INFORMATION
rectangular coss-sectionDUCT COMPONENTSDUCT COMPONENTS
Duct Components (Plastic)according to the MIETZSCH factory standard
Terms / Dimension series
The following terms are used for MIETZSCH ventilation components:Components with a rectangular cross-section: Ducts and fittingsTypes of connectors: G - male connector
M - female connectorR - frame ("rectangular flange"), sub-divided into
R0 - no holesR1 - hole pattern 1 (for normal requirements)R2 - hole pattern 2 (for stricter requirements)
Components and connections with a circular cross-section: Pipes and fittingsTypes of connectors: G - male connector
M - female (pipe socket)F - flange, sub-divided into
F0 - no holesF1 - hole pattern 1 (for normal requirements)F2 - hole pattern 2 (for stricter requirements)
R20 series 100 series Dimension series100 100
110 110125 125140 140160 160180 180200 200 200225 225250 250
Ventilation components with rectangular cross-sections do not have standardised side dimensions. The MIETZSCH dimension series comprises the R20 series according to DIN 323 and the 100-increment series.
If t th i t t d f ti l t ll 280 280300 300
315 315355 355400 400 400450 450500 500 500560 560
600 600630 630
700 700
+ =+ =+ =If not otherwise stated for particular parts, all components such as ducts, fittings, connecting elements, air inlet and outlet elements, etc. are manufactured with these side dimensions.
The nominal sizes always refer to the external dimensions of the ducts and fittings.
00 00710 710800 800 800900 900 9001000 1000 1000
1100 11001120 1120
1200 12001250 1250
1300 1300
R20 series50637590110125140160
Connections and connecting parts with a circular cross-section have the nominal dimensions (diameter) of the R20 series.
The nominal sizes always refer to the external dimensions of the pipes and fittings.
180200225250280315355400450500560630710800900100011201250
01MIETZSCH GmbH Lufttechnik Dresden www.mietzsch.deduct_components (12/10)
Duct Components (Plastic)according to the MIETZSCH factory standard
Dimensioning / Stiffeners
The main loads exerted on the side walls of ventilation ducts and rectangular fittings arise from the pressure differencebetween the inside and the outside of the duct.This causes deformation of the side walls of plastic components (bulging or buckling). The increase in pressure loss in poorlydimensioned ducts may be so severe that the entire system can no longer function, even without components beingmechanically destroyed (no fractures or cracks).Loaded thermoplastics undergo slow creep, thus maximum deformation only occurs after an extended operating period.Although the temperature plays a key role in this case, chemical effects of the gas may also be very important.
The minimum wall thicknesses of unstiffened plastic ducts can be determined according to DIN 4740 and DIN 4741 anddepending on the pressure and temperature as well as the duct dimensions.These calculations are usually carried out using long-term strength values for a loading period of 10 years. In this case, thepermissible deformation is limited to 2% of the largest side of the duct, thus
permissible f < 0.02 x largest duct side
This definition is used as the basis for dimensioning all rectangular air duct components Although these standards only applyThis definition is used as the basis for dimensioning all rectangular air duct components. Although these standards only applyto unstiffened ducts, this 2% requirement is fulfilled by all stiffened ducts and fittings in the MIETZSCH product range.If this deformation narrows the cross-section of the components, the resulting increase in pressure loss can be expected to beabout 5%. This, however, depends on the degree of accuracy of the pressure loss calculation.
Even under "normal" operating conditions (e.g. 1000Pa and 35°C), a PPs duct of 800mm x 800mm requires a wall thickness of15mm to comply with the permissible deflection of 16mm. Thus, components may have to be stiffened, depending on theoperating conditions.
The manufacturer generally specifies the design and dimensions of rectangular air duct components. Therefore, the customermust provide the following information:
maximum internal pressure (over- or underpressure)temperature (permanent, temporary)exposure to media, with material, if appropriaterequired type of stiffening (if necessary)
There are two basic types of stiffening:Examples of duct stiffening
There are two basic types of stiffening:
1) External stiffening
The side walls of the duct are equipped with external ribsor a stiffening frame around the entire circumference.The ribs or frame must be permanently attached to theduct.For low loads (pressure, temperature, dimensions), the
individual plastic rib
circumferential plastic frame
stiffening elements are made of the same thermoplasticmaterial as the duct.For higher loads, the stiffening elements are made ofplastic-coated steel profiles that are attached to the basicbody of the duct. This provides sufficient stability for high-pressure applications.
2) Internal stiffening
plastic-coated steel profile
2) Internal stiffening
Tie rods or a series of tie rods are welded onto the insideof the duct to prevent bulging. If the tie rods are installedas a cross or double cross, they can be additionallysecured at the crossing points.This type of stiffening can only be used for low loads andalso leads to higher pressure losses. The relativelysmooth external surface of the duct is visually
larger duct side is supported by tie rods
advantageous.duct sides are supported by a double cross with fixation at the crossing point
02MIETZSCH GmbH Lufttechnik Dresden www.mietzsch.deduct_components (12/10)
D i ti Di / Di i
Duct Components (Plastic)according to DIN 18379 and the MIETZSCH factory standard
Ducts and fittings
Designation Diagram / DimensionsAbbreviation Preferred dimensions / Comments
No. MIETZSCH Std.Duct, - Wall thicknesses and stiffening
1 air duct according to pressure and temperatureL
(duct section LT - for fitting lengths l+200
b
1 2
for l
D i ti Di / Di i
Duct Components (Plastic)according to DIN 18379 and the MIETZSCH factory standard
Ducts and fittings
Designation Diagram / DimensionsAbbreviation Preferred dimensions / Comments
No. MIETZSCH Std. - Specified dimensions
Elbow = 90° r = 0transition e, f = 150 (for b
Duct Components (Plastic)according to DIN 18379 and the MIETZSCH factory standard
Ducts and fittings
Designation Diagram / DimensionsAbbreviation Preferred dimensions / Comments
No. MIETZSCH Std. - Specified dimensions
Offset l = 100, 200, 300, …..symmetrical
13 ES Inlet and outlet have the
+e1
f-Achse2
same dimensions.See comments on page 6
MWS 54145.00 - Specified dimensions
Offset l = 100, 200, 300, …..transition
f-Achse
1d
2
l
b
e-Achse
+e
c
a
transition14 EA Inlet and outlet have the same width
but different heights.See comments on page 6
MWS 54145.00 - Specified dimensionsc
b
l
l1 2
d
e-Achsea
Tee n = 150 (for b
Duct Components (Plastic)according to DIN 18379 and the MIETZSCH factory standard
Definition of dimensions
Definition of dimensions f and e
Dimensions f and e have either a positive or negative value. It is essential that the + or - sign is given when specifying the dimensions of the component.
Further comments on the definitions:
Axial view of the connection end
The ( f, e ) coordinate system is referenced to the upper right-hand corner of the connection end (Point 1).
The axial deviation of the component is given by the ( f, e ) coordinates of Point 2 of the connection end . Thus:
If Point 2 lies to the right of Point 1, f is positive.If Point 2 lies above Point 1, e is positive.
If Point 2 lies to the left of Point 1, f is negative.If Point 2 lies below Point 1, e is negative.
If h i d i i l di i i d b P i 2 d di i f b P i 2 f (If the connection end is circular, dimension e is governed by Point 2-e and dimension f by Point 2-f (see example 2).
Examples 1 (UA - asymmetric transition)
e ePoint 2
ef negativee negative
f negativee = 0
f = 0e positive
f
2
1
Origin(Point 1)
Point 2
2
Origin(Point 1)
1
Point 2
fOrigin (Point 1)
2
1
f
Examples 2 (RA - asymmetric pipe transition)
1 1 1
e
f negativee negative e
f negativee = 0
Point 2-e
e
f negativee positive
2
Origin (Point 1)
f
Point 2-f
Point 2-e
Point 2-f
Origin (Point 1)
Point 2-e
2
f
2
fOrigin (Point 1)
Point 2-f
06MIETZSCH GmbH Lufttechnik Dresden www.mietzsch.deduct_components (12/10)
1 1 1
Duct Components (Plastic)according to the MIETZSCH factory standard
Connecting elements
Max. ext. dimen- n m sm
sExt. dimensionof duct
G - Male connectorMWS 54010The component has a male connector without a mounted part. Its counterpart must have a female connector.
n
m
sm sion of duct 1) m mm mmup to 125 50 30 2
126 up to 250 50 30 3251 up to 400 50 30 4401 up to 500 80 50 4501 up to 630 80 50 5631 up to 1250 80 50 6
1251 up to 2000 80 50 8
M - Female connector(with socket) MWS 54020
The connector has a welded-on socketsleeve.Its counterpart must have a male connector.
s
ni
mi
mi Max. ext. dimen- ni mi smision of duct 1) m mm mm
up to 250 30 15 2251 up to 400 40 20 3401 t 710 50 25 3
p2001 up to 3000 80 50 10
I - Internal socket (internal socketsleeve) MWS 54020
The end of the component has a socketsm
a
w
401 up to 710 50 25 3711 up to 1250 60 30 41251 up to 2000 80 40 52001 up to 3000 80 40 6
The end of the component has a socketsleeve welded onto the inside.Its counterpart must have a male connectorwith the same internal dimension.
R - Frame (duct flange)MWS 54030sr
dl t
**)
Y
b
**)
The end of the component has a frame.
R0 - no holesR1 - hole pattern 1, t = 125 mm
(normal requirements)R2 - hole pattern 2, t = 75 mm
(stricter requirements)
w
f
ußen
maß
b1
Ød
sion
of d
uct
w Xt
**)
**) If the spacing between the middle holes,
X and/or Y, is
Duct Components (Plastic)according to the MIETZSCH factory standard
Compensators
Sleeve Frame ca.130...170
axb "plate"
Guide
Type M with welded-on socket sleeve
Application:
Type Fwith frame
Type LRwith frame and guiding unit
Application:Used to compensate expansion and to isolate vibrations in ventilation systems. One compensator can compensate an expansion of approx. 30mm.In a PPs duct, a compensator would have to be installed every 20m or so to compensate expansions of 10K.
Systems with greater underpressures should use M-LR or F-LR (with guiding unit) to prevent excessive buckling.
Dimensions: a, b according to the preferred seriesF di t MWS 54030Frame according to MWS 54030
Materials :PVC PVC Wellflex (grey), coupling sleeve and frame made of hard PVCPPs PP Wellflex (black), coupling sleeve and frame made of hard PPs
08MIETZSCH GmbH Lufttechnik Dresden www.mietzsch.deduct_components (12/10)
http://www.mietzsch.de/around4/media/documents/katalog_en/duct_components list of order.pdf
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09MIETZSCH GmbH Lufttechnik Dresden www.mietzsch.deduct_components (12/10)
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Duct Components (Plastic)Dampers
Operating conditions:Max. flow rate = 10 m/sPermissible continuous load (permissible differential pressure) when the damper is closed:
Throttle damper / shut-off damper
BL
H
when the damper is closed:PVC : 1600 Pa at 30 °CPPs : 1000 Pa at 30 °C
Damper drive: Manual, electric or pneumatic actuators, with a mounting bracket for the actuator
Dimensions: W, H according to MIETZSCH gdimension series
Connectors: Male G, Female M, Frame R0, R1 or R2
Back-draft damper, vertical (V) and horizontal (H)
axb
Operating conditions:Max. flow rate = 16 m/s
axb
Loss coefficient: = 0.32
Dimensions: a, b acc. to MIETZSCH dimension series
Connectors: Male G, Female M, Frame R0, R1 or R2
10MIETZSCH GmbH Lufttechnik Dresden www.mietzsch.deduct_components (12/10)
APPLICATIONLouvre dampers are used to regulate the volumetric flow rate and pressure or as a shut-off element in ventilationsystems. All parts that come into contact with the flowing gas are made of plastic, which makes them particularly suitable for applications with corrosive exhaust gases, e.g. laboratory air extraction systems or process air engineering.
DESIGNThe louvre dampers consist of a piece of duct with connecting frame and fitted with profiled hollow slats. The slats are connected to an external rod assembly that co-rotates them all simultaneously. The damper is operated manually or by electric (pneumatic) actuators.
Operating Max. flow rate = 10 m/sconditions: Permissible continuous load (permissible differential pressure) when the damper is closed:
1000 Pa at 30 °C
Loss coefficient: = 0.3 ( Damper position: OPEN )
Dimensions: Width W and height H according to the MIETZSCH dimension series, length 200mm.
Air tightness: Standard as a control damper JKL enhanced air tightness JKLL with additional sealing lips Shut-off damper JKLA tested according to Class 1 as per DIN EN 1751
Damper drive: - Type H - manual adjustment, infinite, with arresting device
- Type M - with actuator Actuators are used in the following models as a standard:
adjustable mechanical limitation of the rotation angleambient temperature -30...+50°C, protection class IP 54
BELIMO actuators, operating time 150s, either AC/DC 24V or AC 230VOPEN/CLOSE Standard drive for OPEN/CLOSE or 3-point controlOPEN/CLOSE-S with integrated auxiliary switch (change-over contact)SR modulating with position feedback DC 2 to 10V
- Model K - with mounting bracket for the actuator (please state type of actuator when ordering)
Connectors: Standard models with frame on both ends (according to MIETZSCH factory standard MWS 54030)no holes R0 / hole pattern R1 / hole pattern R2
Materials: either PVC or PPs, slats PPs
Special models: Other materials, other operating conditions (pressure, temperature)Actuating motors according to customer's requirements, pneumatic drivesExplosion-protected dampers conforming to Directive 94/9/EC (ATEX)
Designation:
H
AUF
ZU
B200
JKL _ - _ - _ _ _ _ - _ _ _ x _ _ _ - _ _ _ _ Type of damper (-, L or A)Drive (H, M or K)Type of connector (R0, R1 or R2)Width WHeight HMaterial
11MIETZSCH GmbH Lufttechnik Dresden www.mietzsch.deduct_components (12/10)
Louvre dampers Model series JKL
manually adjustable / with actuator
Duct Components (Plastic)Air extraction units
Application: Air extraction above workplaces in workshops, filling equipment, laboratories, etc.To be connected to an external fan or ventilation system
Air extraction hood ASH
D ventilation system
Models: Wall-mounting: type WSuspended: type HWith additional baffleSpecial designs
Dimensions: W, D, H and D according to customerrequirements
HT B
W - wall-mounted H - suspended
Edge-mounted air extraction units RAKApplication: Air extraction over baths in the
electroplating industryelectroplating industry
Dimensions: Dimensions W, H and L according to customer requirements or adapted tosuit the constructional situation
Models: Slit widths optimised for the air flowwith throttle damper with cleaning hatchgdetachable cover
D
L
H
B
12MIETZSCH GmbH Lufttechnik Dresden www.mietzsch.deduct_components (12/10)
Duct Components (Plastic)Air outlet units
Design: with optional bird screen VSG
Pressure loss: see diagram
Dimensions: a, b acc. to MIETZSCH dimension series
Deflector hood
300
400
with VSGwithout VSG
pv / Pa
Connectors: Male G, Female M, Frame R0, R1 or R2
a x b0
100
200
0 2 4 6 8 10 12
= 1,2 kg/m³
Velocity in connected duct m/s
L a
b
30°
Mesh guard: mesh guard made of PEmesh aperture 20 mm
Dimensions: a, b acc. to MIETZSCH dimension seriesL=500, 1000 mm
Duct with mesh guard
Application: Air outlet element to trap rain in air inlet and outlet units
Rain trap RAS
30° Connectors: Male G, Female M, Frame R0, R1 or R2
Models: Duct fitted with specially designed, inclined trapping profilesCollecting box on one side with drainage port and cleaning hatch
Dimensions: a, b acc. to MIETZSCH dimension series
Connectors Male GConnectors: Male G, Female M, Frame R0, R1 or R2
100
150
200
pv / Pa
60
70
80
90
100
LW / dB(A)
Fläche a x b / m²8,04,02,01,00,50,25
Pressure loss Sound powerarea
13MIETZSCH GmbH Lufttechnik Dresden www.mietzsch.deduct_components (12/10)
0
50
0 1 2 3 4 5 6 7 8
= 1,2 kg/m³
Geschwindigkeit im Anschlußkanal m/s
40
50
0 1 2 3 4 5 6 7 8Geschwindigkeit im Anschlußkanal m/sVelocity in connected duct m/s Velocity in connected duct m/s
Weather guard Model series WSG
Bird screen
Slat
Type A Type C
H +
15m
m
Hig
ht H
H +
15m
m
Hig
ht H
Hig
ht H
MAIN DIMENSIONS
100 50160Width B 50
H H mm - mm -200 10,1250 7,1315 200 300 400 500 6,4400 5,3 400 8,5
mm
Type CType AW W
mm
MAIN DIMENSIONS
APPLICATION
450 5,0 450 6,7500 4,7 500 6,6
560 600 700 800 900 1000 5,7630 5,7710 5,2800 4,9
Pressure loss coefficient with respect to area W x HAPPLICATIONAir outlet grille with fixed slats to cover the air outlet openings in walls or ends of horizontally installed, rectangular airducts.
If installed in a wall, the opening must be at least 15mm larger than the nominal dimensions W and H.
MODELSTwo different models having different slat designs. Model C is required for spans wider than W=500mm.
Material: choice of PPs, PVC, PE
SPECIAL DESIGNSThe following modifications are available on request:Special dimensions (particularly width W and overall length)Duct connections as a female connector or frame with pipe connector
Weather guard with pipe connector
ØD
B x
H
DESIGNATIONExample: Plastic weather guard, type WSG, width 400mm, height 315, materials PPs
WSG-A 400 x 315 PPs
14MIETZSCH GmbH Lufttechnik Dresden www.mietzsch.deduct_components (12/10)
Duct components with rectangular cross-sectionTerms / Dimension seriesDimensioning / StiffenersDuct Components, Fittings according to DIN 18379Connecting elementsCompensatorsList of measurement / orderDampersLouvre dampersAir extraction unitsAir outlet unitsWeather guard
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