Manual reset thermal limit. Finned tubular steel element. Propeller style fan blade - 2200 RPM/70 CFM. Powder coated 20 ga. steel front. Rough in dimensions - 14-1/2''W x 7-1/8''H; 3-1/2'' deep. Single pole built-in thermostat. Unit not approved for ceiling mount applications. Unit can be positioned to allow left, right or top discharge. Grill dimensions: 16-3/4"W x 7-5/8"H.