Ventilation Ductwork should be tested for Type A (fire outside) and Type B (fire inside) to BS 476 part 24 for a specified time of Stability, Integrity and Insulation (if required).
Ventilation ducts that cross an escape corridor are deemed escape route ducts and in accordance with BS9999:2008, clause 33.4.2, escape route ventilation ducts must be fire rated.
Ventilation ductwork used as part of a pressurisation system must be fire rated and tested as Type A and Type B. Typically used to protected stairways, lobbies, corridors and firefighting shafts, a pressurisation system will provide a positive pressure in defined compartments to prevent smoke entering from adjacent areas. Pressurisation ducts must be able to maintain an air supply to the defined areas for the specified time limits, as defined in terms of Stability and Integrity.
Air supply must be maintained, fire dampers cannot be used.
Fire resisting ductwork may prove to be a cost effective alternative to fire dampers in general ductwork systems (particularly over the lifetime of a building).
|System Description||Material||Stability & Integrity||Insulation|
|Ventilation / Pressurisation||Galvanised Mild Steel||Up to 4 Hours||Up to 2 Hours*|
*Insulation values are obtained through the application of specific insulation
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Our professional approach and continual investment in the training of our staff, technology and manufacturing methods ensure you receive the very best product and service. We are ISO 9001 and Investors in People accredited and manufacture to a high DW144 standard by our own skilled and experienced sheet metal fabricators.
Non Coated galvanized ductwork has significant commercial and environmental savings on systems using intumescent or flame retardant coatings that require energy and chemicals to degrease, etch, prime , paint and dry but also alleviates the inherent problems of damaging these coatings during assembly and installation and compromising the fire resistance of a coated system.
Fire Rated Ductwork:
- 2 hour ductwork
- 4 hour ductwork
- Kitchen Extract Duct
- Smoke Extract Duct
- Fume Extract Duct
All fire rated ducting is manufactured to the Caswell Firesafe specification. See our About Caswell Firesafe page for further information.
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