Caswell Firesafe logoCASWELL FIRESAFE® is a non-coated, fire resisting ductwork system manufactured under a licence issued by Firesafe Fire Rated Ductwork Limited. First developed in 2003, CASWELL FIRESAFE® has been specified and installed in over 500 buildings around the world; many of which are large-scale prestige/landmark projects in their region.

Firesafe Fire Rated Ductwork Limited (FFRDL) is a full member of both ADCAS (Association of Ductwork Contractors & Allied Services) and ASFP (Association for Specialist Fire Protection). In 2019 FFRDL won a Queen’s Award for Enterprise, underlining the quality of its value proposition in CASWELL FIRESAFE® product, technical expertise, 3rd party certification and customer service.

Queen's Award for Enterprise International Trade logo

The prestigious Queen’s Award granted to our Partners Firesafe Fire Rated Ductwork Ltd, holders of the IP for CASWELL FIRESAFE®

C.Caswell Engineering Services Limited is one of only two licensed manufacturing Partners in mainland UK and our Caswell FRD division was created specifically to manage this specialist product for the domestic market. Why not contact us  to discuss how we can help on your project?

CASWELL FIRESAFE® systems are classed as Passive Fire Protection and protect against the spread of fire from one compartment to another. It provides this assurance without the need for enclosures, spray or fabric coverings or an excess of fire/smoke dampers.

CASWELL FIRESAFE® systems are also used for smoke control; in which case passive fire systems must operate under fire conditions. It can be used to quickly and safely exhaust smoke and, as an integral part of a pressurised system, prevent it from entering protected fire escape routes to maximise valuable escape time.

Fire resisting ductwork systems can perform many functions and be specified with many variations and ancillaries to suit the particular application.

CASWELL FIRESAFE® systems are available in both BS 476 : 24 and EN 1366-1 & 8 range variants; within the specification scope of the respective Standards.
Technical Manuals dedicated to each range are available as A4 printed copies or can be downloaded as PDF here.


CASWELL FIRESAFE® CE Marked non-coated fire resisting spiral circular ductwork

CASWELL FIRESAFE® CE Marked, non-coated spiral circular ductwork (Smoke Control – EN 1366-8)


CASWELL FIRESAFE fire resisting ductwork

CASWELL FIRESAFE® non-coated fire resisting ductwork (BS 476 : 24)

CASWELL FIRESAFE® typical Access Door

CASWELL FIRESAFE® typical Access Door detail

CASWELL FIRESAFE® branded flange detail

CASWELL FIRESAFE® branded flange detail (BS 476 : 24)

CASWELL FIRESAFE® Branded Intumescent Sealant & Gasket

CASWELL FIRESAFE® branded Intumescent Sealant & Gasket (BS 476 : 24)










To discuss any of Caswell FRD’s products or services, please visit out contact us page, where you will find contact details.