CAB fans in a soundproof housing made of galvanized sheet steel with thermal and sound insulation from fire-retardant fiberglass (MO) with a thickness of 50 mm. Fan cover is fixed with special latches which provide a tight fit of the cover to the housing of the fan. The fans are equipped with centrifugal impellers with forward-curved blades. The motors have the ability to control the speed with the voltage, performance: 240-3500 m3/h.