It is also sometimes required for a fan to be able to deal with hot temperature continuously, or where you have got particles within the air stream that would damage a motor if it was unprotected. Bifurcated means that the motor is held within its own protected tunnel and therefore does not get exposed to what the air stream is carrying.
A high-quality fan designed to withstand continuous hot temperatures and with a protected motor that does not get exposed to any particles within the airstream. Ideally suited for exhausting or re-circulating fumes, gases and hot air
