*Cabinet Fan – Direct Drive Range is specially designed for wide range of commercial and industrial applications with excellent air flow performance and high static pressure at low sound level to maintain indoor ventilation and air quality continuously. *Compact size for narrow installation space and increase floor space. *Uniquely designed high performance / efficiency external rotor motor. Permanently lubricated ball bearing for reliable and maintenance-free operation. Built-in thermal protection device *Precise designed DIDW forward curve centrifugal fan (sirocco) for stable and best air flow performance *Hi quality rust-resistance galvanized steel sheet casing with optional powder coating finishing, optional Internal insulation with rock wool and perforated aluminum foil for sound attenuation. Customized casing size.