Certain toxic and/or flammable vapours sink to the lowest point which in a car workshop is usually the grease pit. Explosion proof fans from Systemair can eliminate that risk. For the specific project shown on the photo, two centrifugal fans are connected to the exhaust gas extraction. The RIF225 and the RIF250, both equipped with silencers, have double insulated casings suitable for outdoor installations. A silencer is mounted on the pressure side of the air ducts.