Quiet Box Fan (QBF) fan design allows for supply and extract ventilation for areas/rooms with high requirements to low noise levels and limited mounting space. 

Temperature Controller is included 

Units can be installed above ceilings or in loft spaces. Suitable for connection with 100 (4"), 125 (5"), 150 (6"), 200 (8"), 250 (10") and 315 (12") mm round ducts.

Sound level and Fan Volume

100mm - 240m3/hr - 33 dBA

125mm - 330m3/hr - 35 dBA

150mm - 420m3/hr - 36 dBA

200mm - 730m3/hr - 38 dBA

250mm - 1300m3/hr - 41 dBA

315mm - 2150m3/hr - 43 dBA

Design

The fan casing is made of galvanized steel sheet and provided with heat- and sound-insulating material.

Motor

The centrifugal impeller with back-curved blades is powered by means of 2-pole asynchronous motor with external rotor. The motors are equipped with built-in thermal overheating protection with automatic restart. Motor ball bearings with selective lubricating oil ensure low-noise and maintenance-free operation.