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There s also no belt residue and these fans cost less to maintain generally speaking because belts don t wear down and break.
Attic fan belt vs direct drive. Greater efficiency is the biggest pro of direct drive fan configurations. A well balanced direct drive is far quieter than belt. It s incredibly hard to balance a belt and pulley system. Belt drive whole house fans that use an integrated pulley system take longer to install but a belt drive unit provides for a smoother and quieter operation.
Direct drive fans have no power transmission loss since the propeller is directly connected to the motor shaft. Both types are available as direct drive with the fan blade attached to the motor and belt drive with. Coming to the advantage of this kind of an industrial fan the biggest advantage is greater efficiency. Sizing a whole house fan.
This is because of the fact that the amount of friction is greatly reduced in case of this fan when the fan is operating. I fantasized building a small shack outside my house and setting the attic fan in the shack and running a duct up to the attic and through the same vent as an attic fan. Where on a belt drive fan the fan motor shaft has a pulley connected by a belt to a second pulley. Unlike belt driven fans there s less energy loss because there s a reduced amount of friction as the fan operates.
With a belt drive the fan speed can be easily raised or lowered but there is belt and bearing maintenance to consider with a belt drive there are 2 additional bearings. Attic mounts installed in the roof or exterior wall of the attic blow air directly out. The second pulley is connected to a shaft that drives the fan propeller. Most whole house fans are relatively easy to install.
However a belt drive fan has power transmission loss due to the friction between the belt and sheaves and due to the drive shaft bearings. Unlike the belt driven fans in case of a direct drive fan there is lesser energy loss. Belt drive fans are quieter than direct but still noisy.
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