RMD-10-11. Axial Exhaust Fan This downblast fan features die formed axial fan blades riveted to a steel hub. Suitable for roof or wall mounting. Spun aluminum housing for weather resistant durability. Includes birdscreen, totally enclosed, permanently lubricated, ball bearing motor and a disconnect switch, rated for 110°F. 115V Single Phase operation. 500 CFM. Horsepower rating based upon maximum speed/load.