SEAGULL HVAC INDUSTRY WLL QATAR...CERTIFICATE No CF 5647 SEAGULL HVAC INDUSTRY WLL QATAR CASWELL FIRESAFE® Steel Ductwork Systems Page 2 of 14 Signed AH/039 13th July 2018 29th August

This certificate is the property of Exova (UK) Limited trading as Warrington Certification Reg. Office: Exova (UK) Limited, Lochend Industrial Estate, Newbridge, Midlothian EH28 8PL United Kingdom. Co. Reg. No. SC070429

Signed and sealed for and on behalf of Exova (UK) Limited trading as Warrington Certification

Paul Duggan Certification Manager

CERTIFICATE OF APPROVAL No CF 5647

This is to certify that, in accordance with

TS00 General Requirements for Certification of Fire Protection Products The undermentioned products of

Page 1 of 14

SEAGULL HVAC INDUSTRY WLL QATAR Street No 9, Pink Zone, New Industrial Area. P.O. Box 40772, Doha - Qatar

+97444 167183 / 44420263

Have been assessed against the requirements of the Technical Schedule(s) denoted below and are approved for use subject to the conditions

appended hereto: ______________________________________________________________________________

CERTIFIED PRODUCT TECHNICAL SCHEDULE

CASWELL FIRESAFE® Fire Rated Steel Ductwork Systems

TS48 Smoke Control and Fire Resisting Ductwork Systems

Issued: 13th July 2018

Valid to: 29th August 2022

This certificate is the property of Exova (UK) Limited trading as Warrington Certification

Reg. Office: Exova (UK) Limited, Lochend Industrial Estate, Newbridge, Midlothian EH28 8PL United Kingdom. Co. Reg. No. SC070429

CERTIFICATE No CF 5647 SEAGULL HVAC INDUSTRY WLL QATAR

CASWELL FIRESAFE® Steel Ductwork Systems

Page 2 of 14 Signed AH/039


Valid to: 29th

August 2022

1. This approval relates to the use of CASWELL FIRESAFE® steel ventilation, smoke outlet

and kitchen extract ductwork systems in providing fire resistance of up to 240 minutes

stability, integrity and insulation, as defined in BS 476: Part 24: 1987 (ISO 6944: 1985).

Subject to the undermentioned conditions, the ductwork systems will meet the relevant

requirements of BS 9999 for fire resisting compartment ductwork systems, for periods of

up to 240 minutes (dependant upon design limitations) when used in accordance with the

provisions therein.

2. This certification is designed to demonstrate compliance of the product or system specifically with Approved Document B (England and Wales), Section D of the Technical Standards (Scotland), Technical Booklet E (N. Ireland). If compliance is required to other regulatory or guidance documents there may be additional considerations or conflict to be taken into account.’

3. The ductwork systems are approved on the basis of:

i) Initial type testing ii) Audit testing at the frequency specified in TS48

iii) A design appraisal against TS48 iv) Certification of quality management system to ISO 9001: 2008.

v) Inspection and surveillance of factory production control

4. The ductwork systems comprise CASWELL FIRESAFE® steel ductwork, with rock wool

insulation fitted around the outside of the steel ductwork where insulation performance is

required.

5. This approval is applicable to insulated and uninsulated CASWELL FIRESAFE® steel

ductwork systems as described within this Certificate.

6. The ductwork systems shall be mechanically supported from floor and/or wall

constructions or structural steel members having a fire resistance of at least the same

period as the ductwork systems.

7. The approval relates to on going production. Product and/or its immediate packaging is

identified with the manufacturers’ name, the product name or number, the CERTIFIRE

name or name and mark, together with the CERTIFIRE certificate number and

application where appropriate.

8. The approval requires that Seagull HVAC Industry WLL QATAR maintain the licence agreement in place with Firesafe Fire Rated Ductwork Ltd. In the event that Firesafe Fire Rated Ductwork Ltd notify us that the agreement has been terminated or they cease trading, the Certification shall be automatically withdrawn.







Valid to: 29th

August 2022

Horizontal ducts Steel duct assembly The minimum construction requirements for the steel duct are as follows: Wall thickness - minimum 0.8 mm-thick galvanised steel sheet, mild steel sheet or stainless

steel sheet (Tables CT1 to CT10 and CT13), Longitudinal seams - Pittsburgh Lock or Grooved Corner Seam, Cross joints – Roll formed flanges or equivalent or rolled steel angle (RSA) flanged cross-

joints (Tables CT1 to CT10 and CT13), Maximum section length – 1510 mm, Maximum size – 3000 mm wide x 3000 mm high.

The Roll formed flanges or RSA flanges are fastened to the duct with either 4.8 mm-diameter steel rivets at 150 mm nominal centres or spot welds at 75 mm nominal centres. The Roll formed flanges are fitted with steel corner plates, minimum 95 mm x 95 mm x 2.5 mm thick, that slot into the flanges at each corner and are bolted together with an M8 steel nut and bolt at each corner. The flanges are fastened together with 40 mm steel clamps at 300 mm maximum centres. The RSA flanges are fastened together with M8 or M10 steel nuts and bolts (depending on flange size) at the corners and at 250 mm maximum centres. A CASWELL FIRESAFE® intumescent gasket, 12 mm wide x 3 mm thick, is fitted between the flanges and CASWELL FIRESAFE® sealant is used on the seams and flanges as per the construction tables. For most of the range of duct sizes except some smaller sizes, a steel stiffener is fastened to the duct at the maximum centres detailed in Tables CT1 to CT10 and CT13. The stiffeners are fastened to all four sides of the duct with 4.8 mm-diameter steel rivets or spot welds at 150 mm nominal centres. The stiffeners are bolted or welded together at the corners. Where steel stiffeners, flanges and brackets, which are connected to the steel skin of the duct, are described as being fastened to the steel duct skin with steel rivets or spot welds, steel Huck Bolts may be used as an alternative to the steel rivets provided that the centres of the bolts are not greater than the rivet centres and that the diameter of bolts used is at least that of the rivets. Details of the duct construction at sizes other than that tested, up to 3000 mm wide x 3000 mm high, are shown in Tables CT1 to CT4 and CT10 and in the construction and installation drawings shown in Appendices 1 and 2. These give details of the requirements for steel thickness, cross joints and intermediate stiffeners. If tie rods are fitted they are either welded or bolted in position. The requirements for an alternative fully welded construction for mild steel and stainless steel ducts are shown in Tables CT5 to CT8 and in the construction and installation drawings shown in Appendices 1 and 2.







Valid to: 29th

August 2022

Panel-type construction of steel ducts The steel duct is constructed in sections up to 1250 mm long using hot dipped galvanised steel sheet, mild steel sheet or stainless steel sheet 1.2 mm thick. See Firesafe drawings nos. CF206 Sheet 1B and 2A and CF315A. The duct comprises corner panels, 1000 mm x 1000 mm, and flat panels, maximum 2000 mm wide. Each panel is reinforced around the perimeter with steel angle, 50 mm x 50 mm x 5 mm thick, and at mid-depth with a steel angle 75 mm x 50 mm x 5 mm thick. The angles are fastened to the sheet with steel Huck Bolts at maximum 150mm centres or spot welds at maximum 75 mm centres. The panels are fastened together with M10 steel setscrews and nuts at 250 mm maximum centres.

Each section is fitted with tie bars/drop rods at 1500 mm maximum centres, with the two end bars/rods positioned nominally 250 mm from the ends of the section. The bars/rods are connected to the 75 mm x 50 mm stiffening angles with a nut and washer on both sides. The bars/rods are extended to the supporting structure above the duct to form the hangers. The sizes of the bars/rods are calculated for each installation such that the tensile stress in the bars/rods does not exceed 15 N/mm

2 for fire resistance periods up to 60 minutes, 10 N/mm

2 for

fire resistance periods up to 120 minutes and 6 N/mm2 for fire resistance periods up to 240

minutes. The duct sections are fastened together with M10 steel set screws and nuts at 250 mm centres. CASWELL FIRESAFE® gaskets are fitted in all joints.

The maximum size of duct is 8 m wide x 6 m high.

Insulation

The insulation material fitted around the ducts is Rockwool Firepro Duct Slab with a nominal density of 160 kg/m

3. The thicknesses of insulation required for the ducts are shown in Table A1.

Table A1 Insulation thickness Duct

Orientation Fire

resistance- minutes

Maximum size of steel duct without extra support to

insulation – mm x mm

Minimum thickness of board – mm

Duct A Duct B

Horizontal 30 1000x 1000 25 25

60 1500 x 1500 40 40

90 1200 x 1200 70 70

120 1000 x 1000 80 90

240 Req’ for all sizes 80 143*

Vertical 30 1000 x 1000 25 25

60 1500 x 1500 30 30

90 1200 x 1200 50 50

120 1000 x 1000 70 70

240 Req’ for all sizes 80 143*

*143 mm system comprises 13 mm x 96 kg/m³ Insulfrax S Blanket plus 130 mm Rockwool Fire Duct Slab and is described in the CASWELL FIRESAFE® Fire Rated







Valid to: 29th

August 2022

Ductwork Manufacturing and Installation Manual Rev-J- May 2017

The edges of the boards at the longitudinal corner joints of the duct are mitred at 45. The boards are fastened together with either steel pigtail screws at 250 mm maximum centres or bonded with Rockwool Firepro Glue (a high temperature silicate adhesive). Steel wire nails at 500 mm nominal centres are used to hold the boards in position while the glue sets. The nominal length of the pigtail screws is twice the thickness of the board. The boards must be cut to be a close fit to cross joints, stiffeners and hanger bearers.

The edges of the boards at the transverse board joints are cut square. They are bonded together with Firepro Glue. Alternatively, the joints are covered by a strip of Firepro Duct Slab, minimum 100 mm wide x same thickness as the main protection boards, fastened with pigtail screws at 250 mm maximum centres on both sides of the joint. The nominal length of the pigtail screws is 1.5 times the board thickness. If the boards are faced with aluminium foil and a bonded fixing system is used, the foil must be removed from the areas of board to be bonded before the glue is applied. Where the size of the steel duct is larger than the sizes listed in Table A1 additional support are provided to the Firepro Duct Slabs. The support is provided by steel pins, minimum 2.5 mm-diameter, that are stud-welded to the steel duct. The insulation is pushed onto the pins and spring steel washers, 38 mm diameter, are pushed onto the exposed ends of the pins to retain the insulation. The pins are fitted to all four faces of vertical and horizontal ducts with the exception of the top face of horizontal ducts. They are positioned at mid-width of the face at 350 mm maximum centres along the length of the duct. An additional row of pins is added for each additional 500mm width of the face, spaced at 500 mm centres across the face. Longitudinal joints in the boards are square butt joints bonded with Firepro Glue. On the bottom face of

horizontal ducts the ends of the pins are bent over by 90 once the boards and washers have been fitted. At the positions of cross joints and stiffeners on the steel duct, cover strips of Firepro Duct Slab are fitted. The cover strips are minimum 100mm wide x same thickness as the main protection boards, bonded with Firepro Glue or fastened with pigtail screws at 250 mm maximum centres on both sides of the joint. The nominal length of the pigtail screws is 1.5 times the board thickness. The toes of the cross joint and stiffener flanges perpendicular to the duct walls are covered by a thickness of board of at least 50% of the thickness of the main protection boards, with a minimum of 25 mm. For duct types A and B any parts of a hanger bearer that project outside the insulation do not require to be fitted with insulation.







Valid to: 29th

August 2022

Alternative board joint An alternative joint system for longitudinal corner joints in the Firepro Duct Slabs is shown in Firesafe drawing no. CF400A. The joints are square butt joints fastened with Firepro Glue and steel pigtail screws at 250 mm maximum centres. Any foil facing must first be removed from bonded surfaces. The nominal length of the pigtail screws is twice the thickness of the board. Alternative insulation boards Rockwool RW5 Slab, 50 mm thick x 100 kg/m

3 nominal density, and Rockwool Marine Firebatt

2000, 100 mm (2 x 50 mm) x 100 kg/m3 nominal density, boards may be used as alternative

insulation boards. The fixing and support of the boards is the same as for the Firepro Duct Slabs. The thicknesses of insulation required for ventilation and smoke outlet ducts are shown in Tables A2 & A3. Table A2 Insulation thickness - Rockwool RW5 Slab

Duct type Fire

resistance – minutes

Maximum size of steel duct without extra support to insulation – mm x mm


Horizontal ducts A and B

30 1000 x 1000 50

Vertical ducts A and B

30 1000 x 1000 50

Table A3 Insulation thickness - Rockwool Marine Firebatt 2000

Duct type Fire

resistance – minutes

Maximum size of steel duct without extra support to insulation – mm x mm


Horizontal ducts A and B

60 1000 x 1000 100 (2 x 50)

Vertical ducts A and B

60 1000 x 1000 100 (2 x 50)

Hanger supports Details of the hanger supports for different sizes of duct are given in the Firesafe drawings in Appendices 1 to 3 and the support tables in Appendix 5. Each steel hanger consists of two threaded drop rods, minimum M10, and an angle or channel section bearer. The bearer is fastened to the drop rods with hexagonal nuts and washers. A strip of calcium silicate board, minimum 80 mm wide x 12 mm thick, is positioned between the bearer and the steel duct on







Valid to: 29th

August 2022

insulated ducts only. The spacing of the hangers and the size of the steel hanger components must be adjusted so that the tensile stress in the rods and the bending stress in the angles/channels do not exceed 15 N/mm

2 for fire resistance periods up to 60 minutes, 10 N/mm

2

for fire resistance periods up to 120 minutes and 6 N/mm2 for fire resistance periods up to 240

minutes. The maximum spacing of the hangers is 1510 mm. Each hanger is positioned so that it is adjacent to (within 250 mm of) a cross joint or a stiffening collar. The drop rods on uninsulated ducts should be located at a distance of not more than 50 mm from the duct walls. On insulated ducts the drop rods are positioned outside the insulation material but not more than 50 mm from the insulation. Where the required size of the drop rods is very large then multiple smaller drop rods may be used instead. If the expected longitudinal thermal expansion of the drop rods is expected to be greater than 40 mm at 1000˚C then insulation should be fitted to the drop rods adjacent to a penetration seal, as detailed in Firesafe drawing no. CF316. Where the construction of the concrete floor or the structural steelwork above the duct, from which the duct is supported, does not allow the drop rods to be located close to the duct walls, an increase in the distance between the drop rods and the duct walls would not be expected to adversely affect the fire resistance performance of the duct assemblies provided that the sizes of the hanger members are adjusted to comply with the stress limitations stated above. The bearers may be positioned outside of (beneath) the insulation provided that a steel plate, minimum 120 mm wide x 1.2 mm thick x width of the insulated duct, is inserted between the insulation and the top face of the bearer. Hanger fixings The fixings used to fasten the threaded rod hangers to concrete soffits are all-steel expanding anchors with a penetration into the concrete of at least 50 mm for 120 minutes fire resistance and 60 mm for 240 minutes fire resistance. The anchors match the size of the threaded rods, are of sufficient strength to support the weight of the duct and are fitted in accordance with the manufacturer's instructions. Suitable fixings are such as Hilti HKD anchors or equivalent. When fixing to a steel supporting construction, a hole should be drilled through the steel member, allowing the drop rod to be supported by a steel nut and washer above. If a clamp type fixing is used the clamp must be composed of steel, suitable for the purpose and pass around the steel member and be fasten back on itself. Clamps that rely on friction to hold them in place are not suitable. A supporting concrete construction must consist of steel reinforced structural concrete and be capable of supporting the anticipated loads for the required period of fire resistance. In all cases the type of fixing should be designed for the type of concrete and the depth of the fixing may have to be increased to maintain adequate engagement.







Valid to: 29th

August 2022

Penetration seal Details of the modified penetration seal system, where the duct passes through fire compartment walls or floors, are shown in Firesafe drawings nos. CF213A, CF311B & CF312. For insulated ducts, a gasket of ceramic tape 100 mm wide x 3 mm thick is fitted between the collar and the duct wall on all four sides of the duct. The size of the steel angle collar at the penetration seal (100 mm x 100 mm x 3 mm thick) is suitable for all sizes of duct and is fastened to the steel duct at 75 mm maximum centres irrespective of the size of the duct. If the space between the duct and an adjacent floor or wall does not allow the 100 mm wide angle of the collar to be fitted, then the flange of the collar against the fire compartment wall, on the side that the space is restricted, may be reduced provided that the fixing anchors (fastening the collar to the wall) can still be fitted in accordance with the manufacturer’s instructions. A proprietary steel duct penetration seal system may be used as an alternative seal provided that the seal has been shown by test to be suitable for use on steel duct assemblies in terms of BS 476: Part 24: 1987 for the fire exposure period required. Also a cross joint or a steel stiffening collar must be fitted within the thickness of the seal assembly. One, two & three sided steel ducts Details of the alternative steel duct constructions, for ducts close to the soffit of a concrete floor and/or close to a concrete/masonry wall, are shown in Firesafe drawings nos. CF207, CF208 and CF210B. The steel ducts are constructed using hot dipped galvanised steel sheet, mild steel sheet or stainless steel sheet 1.2 mm thick. Tie rods may need to be fitted, as detailed in Tables CT1 to CT8, CT10 and CT13, depending on the size of the duct. One and two sided steel ducts are constructed with flat panels, maximum 3000 mm wide. Each panel is reinforced around the perimeter with steel angle, 45 mm x 45 mm x 5 mm thick, and at mid-width with a steel angle stiffener. The angles are fastened to the sheet with steel Huck Bolts at maximum 150 mm centres or spot welds at maximum 75 mm centres. The panels are connected together at the corners and to the wall or floor with continuous steel angles, 50 mm x 50 mm x 5 mm thick. The 50 mm angles are fastened to the wall of floor with M8 all-steel expanding anchors at 250 mm maximum centres. The panels are fastened together and to the 50 mm angles with M8 steel setscrews and nuts at 250 mm maximum centres with CASWELL FIRESAFE® gaskets fitted in all joints. For three sided steel ducts the trays include an outward flange on the top longitudinal edges, 30 mm wide. At both ends of each duct section steel angles, minimum 30 mm x 30 mm x 4 mm thick, are fastened to the steel sheet to form flanged joints. The angle is fixed to the sheet with 4.8 mm-diameter steel rivets at 150 mm nominal centres. The flanges of adjacent duct sections are fastened together with M8 steel bolts at 250 mm nominal centres. A CASWELL FIRESAFE® gasket is fitted between the flanges at each section joint. The longitudinal flanges of the steel







Valid to: 29th

August 2022

duct are fastened to the concrete soffit with minimum M8 all-steel expanding anchors at 250 mm nominal centres. A 3 mm bead of CASWELL FIRESAFE® Sealant is fitted between the flanges and the concrete soffit. Internal flanges The flanges of cross joints and stiffeners are usually fitted to the outside of the duct. However, RSA flanges may be fitted internally, as shown in Firesafe drawing nos. CF215 Sheet 1A and Sheet 2, as an alternative. They are fastened to the duct in the same way as for external flanges. They are welded together at the corners. Notched flanges Where the duct system connects to a smoke damper it is possible that a modification may be needed to the duct flanges in certain locations. In order to clear the actuator of the smoke damper the section joint flanges of the duct may need to be notched by up to 20 mm for a maximum length of 100 mm. To compensate for the reduction in strength of the flanges an internal galvanised steel cover plate, nominally 200 mm long x 1.2 mm thick, is fitted within the duct. The cover plate overlaps the flange joint by nominally 90mm in both directions and is fastened to the duct with minimum 4.8 mm-diameter steel rivets. The principle of the proposed modification is shown in Firesafe drawing no. CF313. The steel cover plate will reinforce the flange joint where it has been weakened by the notching of the flanges. One, two and three sided insulation for four sided steel ducts A one, two or three-sided protection system may be fitted to four-sided steel ducts that are located immediately adjacent to a wall and/or beneath a concrete soffit. The wall and concrete floor must have a fire resistance in terms of BS 476: Part 21 of at least that required for the duct. The hangers for the steel duct are the same as for the four-sided protection system. Steel angles, minimum 100 mm x 50 mm x 2 mm thick, are fastened to the wall or floor with M8 all-steel anchors (or equivalent for other types of wall or floor) at 400 mm maximum centres. Steel pins are welded or screwed to the angle at 250 mm maximum centres. The Firepro Duct Slab is fitted over the pins and to the steel duct in the same way as for four-sided ducts, as described above. The board joint systems are the same as for the four-sided protection. The arrangement is shown in Firesafe drawing no. CF410A. Vertical ducts The construction of vertical ducts is the same as for horizontal ducts. In order to support the duct system in the vertical orientation, steel sections are fastened to the steel duct, either along the two longer sides or on all four sides. The steel sections either span across the opening in the concrete floor or form part of a cantilever bracket that is fastened to the building structure. The maximum vertical distance between supports is 5.0 m. Also, to prevent buckling of the duct, the







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August 2022

distance between supports should not exceed 8 times the smallest lateral dimension across the outside face of the steel duct. The weight of the duct system is taken by the building structure at each floor level. The stress limit within the steel supports is 15 N/mm

2 for fire exposures of up to

60 minutes, 10 N/mm2 for fire exposures of up to 120 minutes and 6 N/mm

2 for fire resistance

periods up to 240 minutes. The strips of calcium silicate board (used on the hanger supports for insulated horizontal ducts) are not required for vertical ducts. Details of the supports are shown in the Firesafe drawings in Appendix 2. The design of the penetration seal for vertical ducts through concrete floors is the same as for horizontal ducts through masonry walls. Smoke outlet ducts The ducts may be used as smoke outlet ducts. Kitchen extract ducts Details of the construction of kitchen extract ducts at sizes up to 3000 mm wide x 3000 mm high, are shown in Tables CT1 to CT8, CT10 and CT13. These give details of the requirements for steel thickness, cross joints, longitudinal joints and intermediate stiffeners. The construction is the same as for normal ventilation ducts. Where insulated kitchen extract duct systems are specified an insulation thickness of 135 mm is required for a 120 minute rating, 90mm is required for a 60-minute rating and 40mm for a 30-minute rating. Circular ducts Details of the construction of circular straight seamed and spirally wound steel ducts are generally in accordance with those described in DW/144 - Specification for sheet metal duct work - low, medium and high pressure/velocity air systems (published by the Heating and Ventilating Contractors' Association), or equivalent specification, but with the following minimum requirements:

The thickness of steel sheet used in the construction of the ducts ranges from 0.8 mm up to 1.2 mm for larger sizes.

The longitudinal seams and cross joints must be at least equivalent in strength to the seams used on the tested rectangular duct.

The spiral seam of spirally wound ducts must be equivalent to the grooved seam.

The maximum diameter of circular ducts is 1250 mm.

The design of the penetration seal where the duct passes through fire compartment walls or floors must be equivalent to the designs specified for rectangular ducts.







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August 2022

The design of the hanger support systems should be such that the maximum stress in the hanger components does not exceed 15 N/mm

2 for fire resistance periods up to 60 minutes,

10 N/mm2 for fire resistance periods up to 120 minutes and 6 N/mm

2 for fire resistance

periods up to 240 minutes. Details of the duct construction at various sizes are shown in Table CT9. This gives details of the requirements for steel thickness, cross joints and intermediate stiffeners. Where insulation is required for circular ducts, Firepro Duct Slab is fitted around the duct as a square box in the same manner as for rectangular ducts. On horizontal ducts additional hangers are fitted at 1510 mm maximum centres, consisting of steel drop rods and an angle section bearer, which support the Fire Duct Slabs. These hangers are in addition to the hangers supporting the steel duct. Where the diameter of the steel duct exceeds 610 mm then stud-welded pins and washers must be fitted at the mid-width of the board in the same manner as for rectangular ducts. Alternatively the Firepro Duct Slab may be formed into circular sections matching the diameter of the steel duct. This may be achieved in two ways. The first is to pre-form the sections. The second is to cut longitudinal grooves in the inner face of the boards so that they may follow the shape of the steel duct. For both systems the grooves and the board to board joints are bonded with Firepro glue. Steel bands or wires are fitted circumferentially around the protection at 300 mm nominal centres to hold all joints and grooves tightly closed while the adhesive cures. Access panels The details of the construction of different designs of access panel are shown in drawings CF500D, CF502A & CF503G and CF505D. The maximum opening size of the panels is 625 mm x 450 mm. The panels must not interrupt a cross joint or a stiffener. Each of the access panels is constructed with similar components: The opening in the duct wall is reinforced with a steel frame. The Z-section steel frame is fastened to the duct with steel rivets at 150 mm maximum centres. A bead of CASWELL FIRESAFE® intumescent sealant is fitted between the frame and the duct. The access panel door is constructed with two 1.0 mm thick steel trays, welded or riveted together around the perimeter, with mineral wool insulation, 25 mm thick x 60 kg/m

3 nominal density, in the cavity.

The door is fitted within the Z-frame on a high temperature Calcium Magnesium gasket 25 mm wide x 6 mm thick, and held in position with steel fitch (cam-lock) fasteners at 250 mm maximum centres. The fasteners are riveted to the panel door and frame. Details of the construction of the Rockwool Firepro Duct Slab insulation covers over access panels are shown in Firesafe drawings nos. CF408A & CF409A for ducts with surface mounted and recessed access panels.







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August 2022

For protection systems over the recessed access panels, the cover overlaps the opening on all four sides. They are fastened to the main insulation boards with steel pigtail screws at the corners and at 250 mm maximum centres between. For protection systems at least 40 mm thick over the surface mounted access panels, the cover overlaps the opening on all four sides. They are fastened to the main insulation boards with steel pigtail screws at the corners and at 250 mm maximum centres between. For the 25 mm-thick protection system over the surface mounted access panels, strips of board, 25 mm thick, are bonded to the main protection around the opening with Firepro Glue. Any foil facing must first be removed from bonded surfaces. The board overlaps the opening by at least 1.5 x main board thickness. It is fastened to the main insulation boards with steel pigtail screws at the corners and at 250 mm maximum centres between. The screws must penetrate to at least 50% of the thickness of the main insulation boards.

The minimum overlap of the covers for the different insulation board thicknesses are shown in the following table:

Insulation thickness - mm Minimum overlap - mm

25 50

40 60

50 75

70 105

80 120

90 135

130/135/143 195

Some of the thickest covers may be stepped around the perimeter, as shown in the Firesafe drawings. Turning vanes/splitters Turning vanes or splitters may be fitted within the ducts. Turning vanes are constructed from 1.2 mm thick steel, with splitters constructed from the same gauge of steel as the main duct section. Details of the construction of the vanes, the fixing plates and how they are positioned and fastened to the duct are shown in Firesafe drawing no. CF201 and splitters are shown in Firesafe drawing no. CF216.







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August 2022

Attenuators Attenuators may be fitted within the ducts. They consist of pods constructed from galvanised mild steel of stainless steel, of the same thickness as the duct body, with an infill of a non-combustible material such as stone wool or equivalent. The pods are fastened to the duct body with steel rivets at 150 mm centres or spot welds at 75 mm centres. The arrangement is shown in Firesafe drawing no. CF600A. Silencer pods may be incorporated into fully welded duct sections including Melonex lining (or equivalent) for kitchen extract systems. Paint finishes Thin film paint finishes may be applied to the outside of the steel ductwork. The foil facing of insulated ducts may also be painted provided that the paint is water based. The paint finish must comply with the reaction to fire requirements for the building in which the ductwork is being installed.







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August 2022

References Test Reports WARRES No. 128976 WARRES No. 128977

BRE No. TE 7290A

MPA NRW No. 23 0310 786-1 WF 358564 WF 358565 WF 375638 WF No: 334926A WF No: 334926B Assessment report WF 335274 Issue 6

Documents

SEAGULL HVAC INDUSTRY WLL QATAR...CERTIFICATE No CF 5647 SEAGULL HVAC INDUSTRY WLL QATAR CASWELL FIRESAFE® Steel Ductwork Systems Page 2 of 14 Signed AH/039 13th July 2018 29th August