Plug fans are usually employed for recirculation within oven applications. The plug and impellor fit into a square opening cut into wall of the customer’s oven. The casing and inlet are mounted from the inside of the oven. This allows the impellor / plug unit to be withdrawn from the oven without disturbing any equipment.
This arrangement has a shaft and bearings supporting an overhung impellor. The shaft is exposed to the airstream at the back of the impellor hub only. The bearings are outside of the airstream and protected from heat by a cooling disc and shaft seal. The shaft is driven by motor through a flexible coupling. Maximum air temperature is 450ºC (100mm plug depth). Higher temperatures can be accommodated on request.