They are ideal for applications with limited space and high volume the air flow is required. BRF roof fans work with minimal noise. Due to the ideal leaf angles, it offers strong air flow. Silent operation is reached with sintered sockets. The extraordinary power of this device ensures particularly efficient air vacuum. A great benefit of the fan is its low noise, despite the large air flow. High-performance roof fan, fan, fan with air ducts with the same diameter. The roof fan has a previous holder for easy assembly and disassembly. High-performance roof fan, fan, fan is suitable for assembly on the roof and pipe connection. Among other things, it serves to vacuum, for use in non -living rooms such as kitchens, offices, garages, warehouses, workshops, shops, etc. Speed control: Speed.