Wooddryer System exhaust fans consist of an high performance fan blade design for heightened static pressure, heavy duty motor , and an all stainless steel venturi with safety guard. The safety guard and motor mount are integrated for minimum air resistance. Exhaust fans are 100% stainless steel structure with aluminum fan hub, fiber glass reinforced polypropylene blades, and heavy duty motor. Our fan system provides you with maximum protection against corrosion and superior performance for its size; moreover, the direct drives assure practically maintenance free operation.