Box Fan 50" can be used as an exhaust fan in a close house This blower does not use a dynamo motor to drive the propellers, but uses a diesel drive which is connected via a pulley that comes out of the blower body. This Box Fan can be an alternative for chicken coops that are relatively short and have difficulty getting a power source or high electricity rates because they use dieselBox Fan 50" Diesel: Box Fan 50" Diesel Dimension 1,38 x 1,38 x 45