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The industrial fans blowers are most commonly used to provide personnel and spot cooling in industrial and commercial buildings where air conditioning is not feasible or is too costly. Circulating fans can also be the solution to problems such as heat stratification, dampness, and general air stagnation. They can provide general ventilation in heavy-duty commercial and industrial applications including factories, warehouses, gymnasiums, underground parking garages, etc.

Industrial fans and blowers are typically used for high volume, high static pressure applications. Blowers are primarily used to exhaust foul air and replace it with fresh outside air. Many industrial fans and industrial blowers are classified with a numerical designation based upon the construction for the fan. There are three classes recognized by the Air Movement and Control Association (AMCA). Typically, the larger the class number, the greater the minimum performance and price as well. Fans can be thought of as low pressure air pumps that utilize power from a motor to output a volumetric flow of air at a given pressure. A propeller converts torque from the motor to increase static pressure across the fan rotor and to increase the kinetic energy of the air particles. The motors are typically permanent split capacitor AC induction motors or brushless DC motors. Lets look at this system in more detail. Air moving devices are generally described as being either a type of fan or a centrifugal blower. The main difference between fans and blowers is in their flow and pressure characteristics. Fans deliver air in an overall direction that is parallel to the fan blade axis and can be designed to deliver a high flow rate, but tend to work against low pressure. Blowers tend to deliver air in a direction that is perpendicular to the blower axis at a relatively low flow rate, but against high pressure. There are several types of fans, some of the most common being propeller, tube axial and vane axial styles. Propeller fans are the simplest type of fan, consisting of only a motor and propeller. One problem with propeller fans is that tip vortices are produced by the pressure differential across the airfoil section. A tube axial fan (the most common type in electronic cooling systems) is similar to a propeller fan, but also has a venturi around the propeller to reduce the vortices. The vane axial fan has vanes that trail behind the propeller in the airflow to straighten the swirling flow created as the air is accelerated. Centrifugal blowers may have a forward curved wheel, a backward curved wheel, or be of the squirrel cage variety. Industrial and industrial blowers are available in a number of configurations, usually based upon the location in which they are to be placed, or mounted. These include duct fans and blowers; roof and ceiling ventilators, wall and panel mount fans, pressure and volume blowers, freestanding fans and plenum fans. Duct fans and blowers are designed for in-line duct mounting either via flanges or support braces. Roof and ceiling ventilator fans have mounting brackets or flanges specifically for ceiling installation or roof exhaust. Similarly, wall and panel mount fans have mounting brackets or flanges specifically for wall installation or exhaust. Pressure and volume blowers are typically found within an enclosure on a standard factory floor. The specific mounting configuration within the enclosure is designed to provide a common mounting platform for the

blower and its electric motor. The enclosure can be mounted on vibration isolators and maybe referred to as a unitary base or vibration isolation base. Freestanding fans, as the name implies, do not need to be mounted. They can be placed in almost any area for standard air circulation needs. This grouping also includes many portable styles of industrial fans and industrial blowers. Industrial fans and industrial blowers are designed for applications in commercial air-handling systems and pressurized plenums found in industry