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Galvanised steel casing spigotted at both ends. Fans are double inlet forward curved centrifugal powered by 100% fully speed controllable external rotor motors. All motors have class F insulation and IP44 enclosure. Sealed for life bearings. A terminal enclosure is included inside housing. the casing is insulated with 50mm sound absorbent lining protected by a perforated steel inner face giving low noise to surroundings when used with insulated duct installations. Motors have external TK thermal protection facility. Temperature operating range -40C up to 70C.
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