Fire Dampers are not acceptable in Kitchen Extract systems as they can become unserviceable with exposure to grease and become impossible to clean. Excessive heat in Kitchen Extract duct can activate the fusible links in fire dampers. (BS 9999:2008 Clause 18.104.22.168 and 22.214.171.124). Commercial kitchens must have separate and independent extract systems (BS 9999:2008 Clause 33.4.7).
Commercial kitchen extract ductwork should be tested for Type A (fire outside) and Type B (fire inside.) Both tests are required to prevent flammable grease from either catching fire when it passes through an adjacent compartment or, if the grease itself is already alight maintaining the fire within the duct, or causing a fire to start within the adjacent compartment by radiant heat. Under DW 172 (Specification for Kitchen Ventilation Systems) and TR 19 (B&ESA publication, guide to Good Practice- Internal Cleanliness of Ducts). It is recommended that Fire Rated Access Doors should be installed at three metre intervals or a change in aspect or direction where possible for future cleaning and inspection. Internal surfaces must be smooth to enable easy cleaning. Square Bends with turning vanes should be avoided.
Fully welded Mild Steel and Stainless Steel “Grease Tight” ductwork and fittings are also available.
|System Description||Material||Stability & Integrity||Insulation|
|Kitchen Extract||Galvanised Or Stainless||Up to 4 Hours||Up to 60 mins*|
*Insulation values are obtained through the application of specific insulation
All systems are manufactured and installed to satisfy the requirements of recognised ductwork specifications including DW 144 and DW 172
Fire Rated access doors (uninsulated and insulated) are available in the following sizes:
- 200 x 125 Clear Opening
- 300 x 150 Clear Opening
- 450 x 250 Clear Opening
- 525 x 350 Clear Opening
- 625 x 450 Clear Opening
Note! Insulated Access Doors are made to order depending on the required rating of the system.
Trusted by the industry
Our professional approach and continual investment in the training of our staff, technology systems and manufacturing plant ensure you receive the very best product and service. We are ISO 9001:2015 compliant and Investors in People accredited to 2020. Manufacturing to the highest quality control standards. With our internal factory production control (FPC) being maintained by our own skilled and experienced sheet metal fabricators, which is regularly audited by BRE Global and Applus Laboratories.
Considerate to the environment
Non-Coated galvanised fire rated ductwork has significant commercial and environmental savings over systems using intumescent or flame-retardant coatings that require energy and chemicals to degrease, etch, prime, paint and dry. Our systems also alleviate the inherent problems of damaging these coatings during logistics, assembly and installation, which compromises the fire resistance of a secondary coated system.
Supply Only Non Coated Fire Rated Ductwork:
- Rectangular duct up to 3000mm square
- Circular duct up to 1250mm diameter
- Special construction duct up to 8m longest side
- Horizontal and vertical orientations
- Available in Galvanised, Mild & Stainless Steel
- Conventional or Fully Welded construction
- Tested for ‘Fire Outside’ & ‘Fire Inside’ scenarios
- Fire rated Access Doors
- Fire rated Silencers
- Bespoke design for ductwork support systems
All fire rated ducting is manufactured to the CASWELL FIRESAFE® specification. Email us now to obtain a quote for your requirements.
The system was developed and tested in the early 2000’s in accordance with BS476 Part 24 (1987). In recent years further, development and testing in accordance with EN1366 Part 1 (2013) to meet European legalisation including CE marking.
The product is tested to BS 476-24 (1987) and EN 1366-1 (2013) for up to 4 hours stability and integrity and up to 4 hours insulation (fire outside duct) and 2 hours insulation (fire inside duct).
Email us now to obtain a quote for your requirements.