Double skinned acoustically insulated centrifugal box fans for ventilation & air conditioning systems. - Used as supply or extract fans, suitable for many types of ventilation system. - Can be installed & mounted in any position. - The interchangeable panel positions of the unit allow for five possible discharge directions, one connection side of the casing is open as standard (outlet). - Maintenance free ball bearing EC motor with backward curved polymer impeller as standard, providing high efficiency & pressure development. - Casing manufactured from galvanised sheet steel panels with 20mm non-flammable, noise & temperature insulating mineral wool. - Frame manufactured from aluminium with reinforced polyurethane (PA6) corners & perforated internal panel sheets to reduce noise levels in duct systems. - Wide range of speed control through optional 0 - 10V speed controller (6510004). - Max air extract temperature up to: 60°C. - IP55 rated electrical connection box. - Motor is IP54 rated. - Not suitable for polluted air, aggressive or explosive gases.