Die-cast aluminum impeller, welded steel housing; compliant with GB3836 & IEC60079 explosion-prof standards, suitable for Exd lI B T4 class and below explosive gas environments.Ventilation, air exchange, and radiator heating in Zone 1 & Zone 2 hazardous locations including factories and warehouses.AC 50Hz, 220v/38ov; environments without heavy corosion or significant dust. Installation types: wall-mounted,duct-mounted, portable, or fixed; wiring via steel conduit or cable.CBF is an improved version of BAF; installation dimensions are identical to BAF.