BF-I · BF-II · B-I · B-II · GB 50016 compliant
BF Non-Combustible Composite Duct
Non-combustible, corrosion-free ductwork with integral thermal insulation.
BF-I is a magnesite composite duct board system classified non-combustible to GB 5464; BF-II adds low thermal conductivity for insulated runs. Compared with galvanised duct, it never rusts and needs no separate lagging; compared with organic FRP it costs less and does not burn.
Specification
| Material | Glass-fibre reinforced inorganic magnesite composite |
|---|---|
| Classification | Non-combustible to GB 5464; satisfies GB 50016 for HVAC ductwork |
| Forms | FY circular · FJ rectangular, with fittings and reducers |
| Thermal | BF-II low conductivity for insulated supply runs |
| Installation | Gasket and bolted connections; supports per code; no scaffolding loads on duct |
Design notes
- Fire safeInorganic board will not contribute fuel load to a compartment.
- No corrosionUnaffected by condensate, chloride or cleaning chemicals.
- Faster programmeBoards are cut and assembled on site, avoiding long lead times for fabricated metal duct.
- Acoustically betterDense board dampens duct breakout noise compared with thin sheet metal.
Options
- Pre-insulated BF-II
- Fittings and reducers
- Coating for aggressive air
- Site assembly support
Applications
- Basement car parks
- Kitchen extract
- Chemical plants
- Metro and tunnels