Exhaust Fans

Exhaust Fans

Exhaust fans are ventilation systems used to replace stale or contaminated air in hot, dusty or smoky workplaces with fresh, normal temperature air. Designed to move large volumes of air against low resistance, industrial exhaust fans solve facility problems such as heat stratification, general air stagnation and dampness. In their place, exhaust fans offer improved air quality, improved worker health and improved comfort. Exhaust fans are used for applications such as material handling, pneumatic conveying, general ventilation, circulation, drying and light to heavy dust loading. Industries that utilize exhaust fans include agricultural, industrial, automotive, commercial, distribution, printing, food processing and packaging.

Exhaust fans generally consist of an electric motor, fan and mounting brackets or flanges. The most common type of fan used is the propeller-type axial fan. With this type of fan, air currents are generated from circulating blades which direct flow based on the fan's alignment with the axis of the electric motor. The motor is typically attached to the back of the fan. Mounting brackets or flanges are used to mount exhaust fans on roofs, ceilings, walls or panels. Construction materials for exhaust fans and their parts include durable plastics, metals or a combination of both. Exhaust fan systems should operate at static pressures very close to zero in order for the exhaust fan to deliver maximum air flow.

Industrial exhaust fans are classified based on how the fan is constructed; three classes were developed and are recognized by the Air Movement and Control Association (AMA). In most cases, larger class numbers correlate to greater performance and cost of purchase. This classification is not required by the government of all exhaust fans, so other functional and reliable exhaust fans may be classified under other rating systems and standards. Industrial exhaust fans are available in many configurations of velocity, pressure, airflow direction and speed. When choosing an exhaust fan, manufacturers and facility managers consider the environmental conditions, pressure levels and surface areas of the application.

Exhaust Fan Images Provided by Hartzell Fan, Inc.