Smoke and fire ventilation systems

Fire resistant ducts

Firetrace Ductwork Limited
19 Marshall Road
Eastbourne
Sussex
BN22 9AD
United Kingdom

Tel: 01323 400680 • Fax: 01323 400690
Web: www.firetrace-ductwork.co.uk


Certificate No 1345a to SD 198 (Appendix B12)/BS 476-24:1987


Product Duct Type

Condition

Duct Orientation Vertical V- or Horizontal H-

Type/density of insulation

Insulation Thickness (mm)

Fire
Resistance
(Integrity/
Stability)

Fire
Resistance
Insulation

LPCB Ref. No.
Caswell Firesafe

Ventilation Smoke Outlet
Kitchen Extract

Fire inside (Type B) & Fire outside (Type A)

V or H

None

-

240

-

1345a/01
Caswell Firesafe

Ventilation Smoke Outlet

Fire inside (Type B) & Fire outside (Type A)

V or H

Mineral wool 160 kg/m3

25

30

30

1345a/02
Caswell Firesafe

Ventilation Smoke Outlet

Fire inside (Type B) & Fire outside (Type A)

H

Mineral wool 160 kg/m3

40

60

60

1345a/02
Caswell Firesafe

Kitchen Extract

Fire inside (Type B) & Fire outside (Type A)

H

Mineral wool 160 kg/m3

40

30

30

1345a/02
Caswell Firesafe

Ventilation Smoke Outlet

Fire inside (Type B) & Fire outside (Type A)

V or H

Mineral wool 160 kg/m3

70

90

90

1345a/02
Caswell Firesafe

Ventilation Smoke Outlet

Fire inside (Type B) & Fire outside (Type A)

H

Mineral wool 160 kg/m3

90

120

120

1345a/02
Caswell Firesafe

Kitchen Extract

Fire inside (Type B) & Fire outside (Type A)

H

Mineral wool 160 kg/m3

90

60

60

1345a/02
Caswell Firesafe

Ventilation Smoke Outlet

Fire inside (Type B) & Fire outside (Type A)

V

Mineral wool 160 kg/m3

30

60

60

1345a/02
Caswell Firesafe

Ventilation Smoke Outlet

Fire inside (Type B) & Fire outside (Type A)

V

Mineral wool 160 kg/m3

50

90

90

1345a/02
Caswell Firesafe

Ventilation Smoke Outlet

Fire inside (Type B) & Fire outside (Type A)

V or H

Mineral wool 100 kg/m3

50

30

30

1345a/03
Caswell Firesafe

Ventilation Smoke Outlet

Fire inside (Type B) & Fire outside (Type A)

V or H

Mineral wool 100 kg/m3

100 (2x50)

60

60

1345a/04

 

Notes:
1.    LPCB Ref. No's 1345a/01, 1345a/02, 1345a/03 and 1345a/04 - Uninsulated and Insulated Ductwork systems to be manufactured and installed to the specifications as detailed in Report no 335274 Issue 2 dated 15 July 2014.
2.    LPCB Ref. No 1345a/02 Mineral wool specification:  Rockwool FirePro Duct Slab with a nominal density of 160kg/m3. The boards of maximum size 2000mm x 1200mm, have thicknesses of 25, 30, 40, 50, 70 and 90mm.
3.    LPCB LPCB Ref. No 1345a/03 Mineral wool specification: Rockwool RW5 Slab, 50mm thick and 100 kg/m3 nominal density.
4.    LPCB LPCB Ref. No 1345a/04 Mineral wool specification:   Rockwool Marine Firebatt 2000, 100mm (2 x 50mm)  thick and 100 kg/m3 nominal density.
5.    LPCB Ref. No's 1345a/01- covers rectangular and circular ductwork up to 3000mm wide x 3000mm high, reference Firesafe Tables 1 to 4 and circular ductwork up to 1250mm diameter Table 9.  The Firesafe systems may also be employed as attenuator casings as defined in Assessment Report no.335274 Issue 2 dated 15 July 2014 however the LPCB approval does not cover the attenuator itself.
6.    LPCB Ref. No's 1345a/02 - maximum size of steel duct without extra support to insulation for rectangular and circular insulated ductwork when insulation material thick 25mm, 30mm, 90mm is  up to 1000mm x 1000mm, when insulation material thick 70mm - up to 1200mm x 1200mm and when insulation material thick 40mm, 50mm, 70mm - 1500mm x 1500mm. 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. 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.
7.    LPCB Ref. No's 1345a/03 1345a/04 - covers rectangular and circular insulated ductwork up to 1000mm x 1000mm.
8.    LPCB Ref. No's 1345a/01,  1345a/02, 1345a/03 and 1345a/04 - Details of the modified penetration seal system, where the duct passes through fire compartment walls or floors, are shown in Firesafe drawings no's. CF213A, CF311B & CF312.  The parts of the steel collars are bolted together instead of welded and that, 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.
9.    LPCB Ref. No's 1345a/01, 1345a/02, 1345a/03 and 1345a/04 - 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.
10.    LPCB Ref. LPCB Ref. No's 1345a/01, 1345a/02, 1345a/03 and 1345a/04 - an assessment report No 335274 covers systems manufactured from galvanised steel, mild steel and stainless steel and ducts over 3m longest side (in panel construction).
    Ductwork Manufacturers
The following Companies manufacture the products listed on this certificate to a specification issued and controlled by Firetrace Ducktwork Limited
These Companies are audited by the LPCB to ensure the product certification requirements are met.
    Airtrace Sheet Metal Limited (LPCB Ref. No. 1345)
19 Marshal Road
Eastbourne
East Sussex
BN22 9AD

 


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