CERTIFICATE OF APPROVAL No CF 680 SEAGULL (HVAC

Transcription

CERTIFICATE OF APPROVAL
No CF 680
This is to certify that, in accordance with
TS00 General Requirements for Certification of Fire Protection Products
The undermentioned products of
SEAGULL (HVAC) INDUSTRY LLC
P.O. Box: 27743, Dubai, United Arab Emirates.
Tel: 00 971 4 347 0047 Fax: 00 971 4 347 0824
Intellectual Property Rights Owned by:
FIRESAFE FIRE RATED DUCTWORK LTD
Knowsley Road Industrial Estate
Rossendale, Lancashire, BB4 4RR
Email: [email protected]
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
DTS48 Smoke Control and Fire
Resisting Ductwork Systems
Signed and sealed for and on behalf of CERTIFIRE
Sir Ken Knight
Chairman - Management Council
Page 1 of 32
Issued: 15th June 2009
Valid to: 14th June 2014
CERTIFICATE No CF 680
Caswell Firesafe Steel Ventilation, Smoke Outlet and Kitchen Extract
Ductwork Systems
1.
This approval relates to the use of the above ductwork systems in providing fire
resistance of up to 240 minutes stability and integrity and up to 120 minutes 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)
ii)
iii)
iv)
v)
Initial type testing
Audit testing at the frequency specified in TS48
A design appraisal against TS48
Certification of quality management system to ISO 9001: 2000.
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 LLC maintain the licence agreement
in place with Firesafe Fire Rated Ductwork Ltd, this is subjected to the terms and conditions laid
down in the agreement dated 1st of December 2007 and valid to 1st December 2012. If this
agreement is terminated for any reason or not renewed when it falls due the certification with be
withdrawn.
Page 2 of 32 Signed
Caswell Firesafe Steel Ductwork Systems
Horizontal ducts
Steel duct assembly
The minimum construction requirements for the steel duct are as follows:
Wall thickness - minimum 0.8mm-thick galvanised steel sheet, mild steel sheet or stainless steel
sheet (Figure 1),
Longitudinal seams - Pittsburgh Lock or Grooved Corner Seam,
Cross joints – MEZZ flanges or equivalent or rolled steel angle (RSA) flanged cross-joints (Figure
1),
Maximum section length - 1510mm,
Maximum size – 3000mm wide x 3000mm high (Figure 1).
The MEZZ flanges or RSA flanges are fastened to the duct with either 4.8mm-diameter steel
rivets at 150mm nominal centres or spot welds at 75mm nominal centres. The MEZZ flanges are
fitted with steel corner plates, minimum 95mm x 95mm x 2.5mm 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 40mm steel clamps at 250mm maximum centres. The RSA flanges
are fastened together with M8 steel nuts and bolts at the corners and at 250mm maximum
centres. A Caswell Firesafe intumescent gasket, 12mm wide x 3mm thick, is fitted between the
flanges.
For all duct sizes over 600mm a steel stiffener is fastened to the duct at 750mm maximum centres
(630mm maximum centres for ducts over 1500mm). See Figure 1. The stiffeners are fastened to all
four sides of the duct with 4.8mm-diameter steel rivets or spot welds at 150mm 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.
The requirements for an alternative fully welded construction are shown in Figure 2.
Panel-type construction of steel ducts
The steel duct is constructed in sections up to 1250mm long using hot dipped galvanised steel sheet,
mild steel sheet or stainless steel sheet 1.2mm thick (Figure 4). The duct comprises corner panels,
1000mm x 1000mm, and flat panels, maximum 2000mm wide. Each panel is reinforced around the
perimeter with steel angle, 50mm x 50mm x 5mm thick, and at mid-depth with a steel angle 75mm x
50mm x 5mm thick. The angles are fastened to the sheet with steel Huck Bolts at maximum 150mm
centres or spot welds at maximum 75mm centres. The panels are fastened together with M10 steel
setscrews and nuts at 250mm maximum centres.
Page 3 of 32 Signed
Each section is fitted with tie bars/drop rods at 1500mm maximum centres, with the two end
bars/rods positioned nominally 250mm from the ends of the section. The bars/rods are
connected to the 75mm x 50mm 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
limiting stresses in the bars/rods are 15N/mm2 for fire resistance periods up to 60 minutes,
10N/mm2 for fire resistance periods up to 120 minutes and 6N/mm2 for fire resistance periods up
to 240 minutes. The duct sections are fastened together with M10 steel set screws and nuts at
250mm centres. Caswell Firesafe gaskets are fitted in all joints.
The maximum size of duct is 8m wide x 6m high.
Insulation
The insulation material fitted around the ducts is Rockwool Firepro Duct Slab with a nominal
density of 160kg/m3. The thicknesses of insulation required for the ducts are shown in Table 1.
Table 1 Insulation thickness
Duct type
Horizontal
ducts A
and B
Vertical
ducts A
and B
Fire
resistance
– minutes
30
60
90
120
30
60
90
120
Maximum size of steel duct
without extra support to
insulation – mm x mm
1000 x 1000
1500 x 1500
1200 x 1200
1000 x 1000
1000 x 1000
1000 x 1000
1500 x 1500
1500 x 1500
Minimum
thickness of
board – mm
25
40
70
90
25
30
50
70
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 250mm maximum centres or
bonded with Rockwool Firepro Glue (a high temperature silicate adhesive). Steel wire nails at
500mm 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 100mm wide x same thickness as the main protection boards, fastened with pigtail
screws at 250mm 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.
Page 4 of 32 Signed
Where the size of the steel duct is larger than the sizes listed in Table 1 additional support are
provided to the Firepro Duct Slabs. The support is provided by steel pins, minimum 2.5mmdiameter, that are stud-welded to the steel duct. The insulation is pushed onto the pins and
spring steel washers, 38mm 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
350mm 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 500mm 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 250mm 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 25mm.
For duct type A (fire outside) any parts of a hanger bearer that project outside the insulation do
not require to be fitted with insulation. However, for duct type B (fire inside) any parts of a
hanger bearer that project outside the insulation must be protected with Firepro Duct Slab, at
least 25mm thick, except for the ends of the bearers (where the drop rods are attached).
Alternative board joint
An alternative joint system for longitudinal corner joints in the Firepro Duct Slabs is shown in
Figure 5. The joints are square butt joints fastened with Firepro Glue and steel pigtail screws at
250mm maximum centres. Any foil facing is removed from bonded surfaces. The nominal
length of the pigtail screws is twice the thickness of the board.
Hanger supports
Details of the hanger supports for different sizes of duct are given in Figures 6, 8 and 9. 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 80mm wide x 12mm thick, is positioned between the bearer and
the steel duct on insulated ducts only. The spacing of the hangers and the size of the steel
hanger components are adjusted so that the tensile stress in the rods and the bending stress in
the angles/channels do not exceed 15N/mm2 for fire resistance periods up to 60 minutes,
10N/mm2 for fire resistance periods up to 120 minutes and 6N/mm2 for fire resistance periods up
to 240 minutes. The maximum spacing of the hangers is 1510mm.
Page 5 of 32 Signed
Each hanger is positioned so that it is adjacent to (within 250mm of) a cross joint or a stiffening
collar. The drop rods on uninsulated ducts should be located at a distance of not more than
50mm from the duct walls. On insulated ducts the drop rods are positioned outside the insulation
material but not more than 50mm from the insulation.
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 120mm wide x 1.6mm 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 50mm for 120 minutes fire resistance and
60mm 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.
Penetration seal
Details of the penetration seal system, where the duct passes through fire compartment walls or
floors, are shown in Figures 7 to 9. For insulated ducts, a gasket of ceramic tape 100mm wide x
3mm 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 (100mm x 100mm x 3mm thick) is
suitable for all sizes of duct and is fastened to the steel duct at 75mm maximum centres
irrespective of the size of the duct.
Page 6 of 32 Signed
If the space between the duct and an adjacent floor or wall does not allow the 100mm 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.
Three sided ducts
A three-sided insulation system may be fitted to four-sided steel ducts that are located
immediately beneath a concrete soffit. The concrete floor must have a fire resistance in terms of
BS 476: Part 21 of at least that required for the duct. The hangers are the same as for the foursided protection system but are located outside the duct protection. A 100mm-wide strip of
Firepro Duct Slab, at least 40mm thick, is sandwiched between the top of the steel duct and the
soffit of the concrete floor, along the length of the duct on both sides, and bonded in position with
Firepro Glue. The thickness of the board must be greater than the depth of the flanges of the
cross joints and stiffeners so that the board is held tightly in position.
The side panels of Firepro Duct Slab are bonded to these strips as for the four-sided protection
system. The board joint systems are the same as for the four-sided protection.
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 4.0m. Also, to prevent buckling of the duct, the 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 10N/mm2 for fire exposures of up to 120 minutes and
2
6N/mm 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 Figure 10.
On insulated ducts, the supporting steel members, where they emerge from the protection around the
duct, are clad with the same thickness of insulation for at least 300mm.
The design of the penetration seal for vertical ducts through concrete floors is the same as for
horizontal ducts through masonry walls.
Page 7 of 32 Signed
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 3000mm wide x 3000mm high, are
shown in Figures 1 and 2. This gives 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 90mm is
required for a 60-minute rating and a thickness of 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 is 1.0mm for ducts up to
500mm diameter and 1.2mm 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 1250mm.
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.
The design of the hanger support systems should be such that the maximum stress in the
hanger components does not exceed 15N/mm2 for fire resistance periods up to 60 minutes,
10N/mm2 for fire resistance periods up to 120 minutes and 6N/mm2 for fire resistance
periods up to 240 minutes.
Details of the duct construction at various sizes are shown in Figure 3.
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 1510mm 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 610mm then studwelded pins and washers must be fitted at the mid-width of the board in the same manner as for
rectangular ducts.
Page 8 of 32 Signed
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 preform 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
300mm nominal centres to hold all joints and grooves tightly closed while the adhesive cures.
Access panels
The details of the construction of three different designs of access panel are shown in Figures 11
and 12. The maximum opening size of the panels is 900mm x 900mm. The panels must not
interrupt a cross joint or a stiffener. Where the opening size exceeds 625mm x 450mm the panel
should not be located in the bottom face of horizontal ducts. Each of the access panels is
constructed with similar components:
•
•
•
•
The panel is made of 1.6mm thick steel. The panels are stiffened either with a perimeter
steel frame or by forming the perimeter with a 10mm lip.
The opening in the duct wall is reinforced with a steel frame. The frames are screwed,
riveted or welded to the duct, sealed with a bead of Caswell Firesafe intumescent sealant.
A 20mm wide x 6mm thick ceramic tape gasket is fitted between the panel and the duct.
The panels are fastened to the duct with M6 steel set screws, at 150mm maximum centres,
and steel wing nuts and washers.
The details of the construction of a fourth design of access panel are shown in Figure 13. The Zsection steel frame is fastened to the duct with steel rivets at 150mm 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 1.0mm thick steel trays, welded or riveted together around the
perimeter, with rock wool insulation, 25mm thick x 60kg/m3 nominal density, in the cavity. The
door is fitted within the Z-frame on a ceramic tape gasket, 25mm wide x 6mm thick, and held in
position with steel fitch (cam-lock) fasteners at 250mm maximum centres. The fasteners are
riveted to the panel door and frame. The maximum opening size of the panels is 625mm x
450mm.
Details of the construction of the insulation covers over access panels are shown in Figure 14 for
ducts protected with 90mm-thick Firepro Duct Slab and Figure 15 for ducts protected with Firepro
Duct Slab less than 90mm-thick.
For the 90mm-thick protection system, the cover consists of two layers of board fastened
together with steel pigtail screws, 160mm long, at the corners and at 250mm maximum centres
between. The inner layer of board is cut to be a close fit within the main insulation to the steel
duct and is notched out over the access door handle so that its outer surface is flush with the
main insulation. The outer 90mm-thick layer of board overlaps the opening by at least 135mm
on all four sides. It is fastened to the main insulation boards with steel pigtail screws, 180mm
long, at the corners and at 250mm maximum centres between.
Page 9 of 32 Signed
For protection systems less than 90mm-thick strips of board are bonded to the main protection
around the opening with Firepro Glue. Any foil facing is removed from bonded surfaces. The
insulation cover consists of two layers of board fastened together with steel pigtail screws at the
corners and at 250mm maximum centres between. The inner board is cut to be a close fit within
the opening. The outer 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 250mm
maximum centres between. The screws must penetrate to at least 50% of the thickness of the
main insulation boards.
The details of the covers for the different insulation board thicknesses are shown in the following
table:
Insulation
thickness - mm
Perimeter strips
– no x mm
Insulation cover
– mm
Minimum overlap
- mm
25
2 x 25
2 x 25
50
40
1 x 40
2 x 40
60
50
1 x 50
2 x 50
75
70
1 x 40
70 + 40
105
For openings larger than 550mm x 550mm an additional row of pigtail screws should be fitted across
the middle of the cover, fastening the two layers of board together.
Turning vanes
Turning vanes may be fitted within the ducts. They are constructed from 2mm thick steel.
Details of the construction of the vanes, the fixing plates and how they are positioned and
fastened to the duct are shown in Figure 16.
Attenuators
Attenuators may be fitted within the ducts. They consist of pods constructed from galvanised
mild 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
150mm centres or spot welds at 75mm centres. The arrangement is shown in Figure 17. The
additional weight of the pods must be allowed for when calculating the maximum stresses within
the hanger supports.
Page 10 of 32 Signed
Alternative designs of 3-sided horizontal duct assemblies close to a concrete soffit
System 1
See Figure 18. The 3-sided tray of each duct section, maximum 750mm long, is constructed with
galvanised mild steel either 1.0mm or 1.2mm thick. The trays are up to 2000mm wide x 500mm
high and include an outward flange on the top longitudinal edges, 30mm wide. At both ends of
each duct section steel angles, 30mm x 30mm x 4mm thick, are fastened to the steel sheet to
form flanged joints. The angle is fixed to the sheet with 4.7mm-diameter steel rivets at 150mm
nominal centres. The flanges of adjacent duct sections are fastened together with M8 steel bolts
at 250mm nominal centres. A Caswell Firesafe gasket, 12mm wide x 3mm thick, is fitted
between the flanges at each section joint.
The longitudinal flanges of the steel duct are fastened to the concrete soffit with minimum M8 allsteel expanding anchors at 250mm nominal centres. A 3mm bead of Caswell Firesafe Sealant is
fitted between the flanges and the concrete soffit. The duct sections are constructed with
1.0mm-thick sheet for duct widths up to 800mm and 1.2mm-thick sheet for larger duct widths up
to 2000mm.
Where insulation is required the Rockwool Firepro Duct Slab is fastened to the duct using the
steel pin fixing system.
System 2
See Figures 19 and 20. The duct section is either a 4-sided duct, with a Pittsburgh Lock
longitudinal seam, or a 3-sided tray. Each duct section, maximum 750mm long, is constructed
with galvanised mild steel either 1.0mm or 1.2mm thick. The trays are up to 2000mm wide x
500mm high. The 3-sided tray includes an inward flange on the top longitudinal edges, 30mm
wide. At both ends of each duct section steel angles, 30mm x 30mm x 4mm thick, are fastened
to the bottom and side edges of the steel sheet to form flanged joints. The angle is fixed to the
sheet with 4.7mm-diameter steel rivets at 150mm nominal centres. The flanges of adjacent duct
sections are fastened together with M8 steel bolts at 250mm nominal centres. A Caswell
Firesafe gasket, 12mm wide x 3mm thick, is fitted between the flanges at each section joint.
Each 3-sided tray duct section is fitted with a galvanised mild steel lid either 1.0mm or 1.2mm
thick. The lid is fastened to the top longitudinal flanges of the duct section with 4.7mm-diameter
steel rivets at 150mm nominal centres. Caswell Firesafe intumescent acrylic sealant is fitted in
the lid to top flange joints. The ends of each lid are formed into a return, 15mm deep. The
returns of adjacent lids (and the top wall of the 4-sided ducts) at each section joint are connected
with a steel C-cleat, minimum 2mm thick. The duct sections and lids are constructed with
1.0mm-thick sheet for duct widths up to 1000mm and 1.2mm-thick sheet for larger duct widths up
to 2000mm.
Steel stirrup brackets at 1500mm maximum centres support the duct. Each stirrup is constructed
with steel flat, 50mm wide x 3mm thick, that is bent to the profile of the duct and that includes a
50mm flange at both ends. Each flange is either directly fastened to the concrete floor with an
all-steel expansion anchor, minimum M10, or fastened by a steel drop rod. The fixing anchors
must engage the concrete for at least 50mm for fire ratings up to 120 minutes and at least 60mm
for fire ratings up to 240 minutes. The tensile stress in the drop rods, bolts and the stirrups must
not exceed 10N/mm2 for fire resistance periods up to 120 minutes and 6N/mm2 for fire resistance
periods up to 240 minutes.
A spacer of calcium silicate board, 80mm wide x 12mm thick, is fitted between the stirrup and the
underside of the steel duct on insulated ducts. The stirrup brackets should be positioned not
more than 100mm from a flanged section joint. The vertical parts of each stirrup must not be
more than 50mm from the duct wall. Where the ratio of the duct width to the height exceeds 4:1
then the stirrups should be fitted at 750mm maximum centres.
Where the duct systems are being used as a smoke outlet duct a vertical steel rod must be fitted
at mid-width at each section joint to ensure that the cross section area of the duct is maintained.
The rods, minimum 8mm-diameter, are required where the duct width exceeds 1000mm.
Where insulation is required the Rockwool Firepro Duct Slab is fastened to the duct using the
steel pin fixing system.
Reference
Test Reports
Warringtonfire test report numbers;
Warres No: 128976
Warres No: 128977
Assessment Report
Warringtonfire assessment report numbers;
WF: 148903
WF: 153705
WF: 163966
Figure 1 Rectangular ductwork specification
Figure 2 Rectangular ductwork specification – welded construction
Figure 3 Circular ductwork specification
Figure 4 Panel-type steel duct construction
Figure 5 Alternative insulation butt joint system
Figure 6 Hanger support system
Figure 7 Wall penetration collar assembly
Figure 8 Additional penetration seal details
Figure 9 Penetration seal and hanger details for insulated ducts
Figure 10 Vertical duct support details
Figure 11 Flat bar access panel
Figure 12 Welded kitchen extract access panel
Figure 13 Standard access panel
Figure 14 Access panel insulation detail – 90mm
Figure 15 Access panel insulation detail – 25mm to 70mm
Figure 16 Turning vanes
Figure 17 Attenuator
Figure 18 Alternative 3-sided duct assembly – System 1
Figure 19 Alternative 3-sided duct assembly – System 2
Figure 20 Supports for alternative 3-sided duct assembly – System 2

CERTIFICATE OF APPROVAL No CF 680 SEAGULL (HVAC

Transcription

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