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Cary Products offers blower housings, blower wheels and complete blower assemblies with choices covering a wide range of construction techniques and applications. These devices can act as the primary air mover in HVAC and MVAC systems, or as HVAC accessories, boosting air output in spaces that need more even temperature control.
A blower assembly starts with a blower wheel. Nicknamed “squirrel cage” fans because they resemble the treadmill wheels found in squirrel and hamster cages, these fans have blades that pull air from the inside of the wheel and push it outward. Depending on the design, the motor can be attached directly to either the external or internal side of the wheel hub or indirectly via a belt and pulley system.
Plastic Blower Wheels
Plastic blower wheels offer lower cost compared to metal wheels due to simpler construction, and they provide better performance thanks to their ability to resist deformation.
Cary Products offers a wide range of single and double inlet blower wheels made from the following materials and colors:
13% GF Nylon – Black
25% GF Nylon – Black
30% GF Nylon – Black
20% Talc Filled Polypropylene – Black or Natural
40% Calcium Carbonate Polypropylene – Black
Since the blower wheel directs air outward across its entire surface, a blower wheel housing is needed to aim that air in a single direction. This housing covers the blower wheel, directing air from the outside into the wheel’s center, then captures the exiting air, leading it a single outlet.
A basic blower assembly includes the blower wheel and housing, while a blower motor assembly includes the wheel, housing and motor as a single unit.
For blower assemblies with internal motor designs, a support bracket over the air intake holds the rear of the motor in place. This makes the blower more compact and places the motor in the air flow path for improved cooling. External blower assembly designs increase the size of the intake, improving air flow and allowing for quick access to the wheel for cleaning debris.
Some applications use a motor with a long drive shaft exiting the front and rear of the motor housing. These shafts drive a pair of blower wheels, each with their own air pathway. This design can use a single housing that incorporates both pathways or separate housings for each fan.
Blower Housing Design
Design choices are mostly a matter of application. A furnace blower assembly pushes air through either a combustion chamber or heating element in the furnace and into the ductwork. These typically use an internal mount design with an A/C motor that runs off of household electricity. Dual inlet wheels are common because the center mounted hub provides enough space to accommodate the motor while providing the airflow benefits of an external design to the non-motor side of the wheel.
In MVAC parts applications, a heater blower assembly is the unit that directs air through the heater core and into the cabin. These typically use an external motor, making it easier to clean out any debris that make it into the housing. The motor itself is DC so that it can be wired to the vehicle’s electrical system.