Attic Fan Belt Vs Direct Drive

This is because of the fact that the amount of friction is greatly reduced in case of this fan when the fan is operating.

Attic fan belt vs direct drive.

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. Most whole house fans are relatively easy to install. Direct drive fans have no power transmission loss since the propeller is directly connected to the motor shaft. Greater efficiency is the biggest pro of direct drive fan configurations.

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. A well balanced direct drive is far quieter than belt. There s also no belt residue and these fans cost less to maintain generally speaking because belts don t wear down and break. Direct drive models are the most do it yourself friendly because for most no attic joists need to be cut.

The second pulley is connected to a shaft that drives the fan propeller. Belt drive fans are quieter than direct but still noisy. Where on a belt drive fan the fan motor shaft has a pulley connected by a belt to a second pulley. It s incredibly hard to balance a belt and pulley system.

That would be quiet but would look like a mess from outdoors. Attic mounts installed in the roof or exterior wall of the attic blow air directly out. 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 belt driven fans there s less energy loss because there s a reduced amount of friction as the fan operates.

Sizing a whole house fan. It s balance or lack of balance actually which causes most of the noise. Unlike the belt driven fans in case of a direct drive fan there is lesser energy loss.