Good practice dictates that fire dampers should not be installed within certain ductwork systems in buildings (e.g. kitchen extract systems , staircase and lobby pressurisation, lift shaft ventilation, fresh air make up provision, Smoke Extract etc.) and this is where fire resistant ductwork should be used.

Fire contained either outside the duct (type A) or inside the duct (type B) will inhibit the spread of fire from one compartment to another within a building.

Fire-resistant ventilation ductwork is necessary as an integral part of maintaining fire compartments within a building and ensure that a means of escape from the building are not compromised.

Fire resisting ductwork must be used in multi compartment Kitchen Extract Systems, Smoke Extract Systems and where ducts must comply with either type A or type B strategies.

Fire-resistant duct can be more cost effective than using fire dampers especially motorised type which have to be linked to the fire alarm system/BMS. Fire resistant ducts do not require on-going maintenance or testing/inspection which is another advantage over the use of fire dampers.

These include:

  • Fit and forget maintenance
  • Initial Cost

Your fire damper will not work if…

  • It is the wrong type of fire damper for the duct
  • There is large gap between the fire damper and the duct
  • The blades have collapsed
  • The cassettes won’t operate
  • The springs have jammed or corroded
  • It has been jammed open
  • It’s been installed incorrectly

Trusted by the trade

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.

As the trade’s most trusted and reputable ductwork manufacturer, we are dedicated to meeting all your requirements. For ductwork contractors with their own large manufacturing facilities, we can supply any volume of manufacture to suit the immediate needs and requirements.

Some clients need continual top up and surplus manufacture in addition to their own factory outputs at those inevitable and sometimes continual pinch points.

For contractors without their own fabrication facilities, we manufacture full drawings through to emergency works issues, of any pre-detailed rectangular metal ducting.


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.

LPS-SD198(appendix B12)
BS476 part 24 1987
Cert - LPCB Ref 1345a

firesafe firesafe FSB ADCAS Caswell Fireafe