What is the definition of a wall mounted upblast exhaust fan? A wall mounted upblast exhaust fan is a type of fan used to ventilate and exhaust air from commercial, industrial, or residential buildings. It is typically mounted to the exterior wall of the building and utilizes an upblast configuration to exhaust the air upwards and away from the building. This type of fan is commonly used in kitchens, bathrooms, and other areas where odors, fumes, and smoke need to be removed from the building. It is also used in industrial settings for ventilation and air circulation. The fan operates by sucking air in through its inlet and then propelling it out using the fan blades. The blades are encased in a housing that contains a motor, a fan wheel, and a motor shaft. The motor provides power to the fan wheel and the motor shaft, causing the wheel to spin and force the air out of the fan. The fan wheel is typically made out of aluminum or steel and is