What is the purpose of a blower housing depends on context, as the term is used for several devices, but generally it is an enclosure that contains and directs airflow from a blower or fan. In HVAC systems, the blower housing is the metal casing that surrounds the furnace blower fan or air handler fan, its purpose is to contain the fan wheel, direct air from return ducts into fan and out to supply ducts efficiently, reduce noise, protect fan from debris, and provide mounting for motor. Without proper housing, fan would not create pressure to move air through ductwork. In automotive, blower housing surrounds heater and AC blower motor to direct air into cabin. In leaf blowers and shop vacs, blower housing directs high velocity air. In energy testing, blower door housing is not a term, but blower door fan has housing. In general engineering, blower housing purpose is to convert rotational energy of impeller into pressure and airflow in desired direction, prevent air from recirculating, improve efficiency, and provide safety by covering moving parts. It is designed with specific shape, often scroll shape, to optimize airflow and minimize turbulence and noise while maximizing air delivery.
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