Direct Drive Vs Belt Drive Attic Fan

Unlike belt driven fans there s less energy loss because there s a reduced amount of friction as the fan operates.

Direct drive vs belt drive attic fan. That would be quiet but would look like a mess from outdoors. This is because of the fact that the amount of friction is greatly reduced in case of this fan when the fan is operating. 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. Direct drive fans have no power transmission loss since the propeller is directly connected to the motor shaft.

Belt drive turntables by contrast usually take several seconds to get up to speed. Belt drive fans are quieter than direct but still noisy. 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.

Direct drive models are the most do it yourself friendly because for most no attic joists need to be cut. I had a belt drive with a two speed motor years ago. Direct drive tables also will give you a speed control so as a dj if you want to change the tempo to blend one song into another with two turntables it is pretty easy to do so with the range of speed adjustment available on a direct drive table. Direct drive fans have motor bearings only and on motors typically 7 and a half horsepower and larger those motor bearings are regreaseable so direct drive fans should be designed for acceptable bearing life and.

In a direct drive configuration the fan motor that controls the movement of the fan blades is connected either to a shaft or fan axle. Direct drive fans require fewer parts and thus usually less maintenance. That pulls more air with less fan noise. Unlike the belt driven fans in case of a direct drive fan there is lesser energy loss.

I think that the belt drive blades can turn slower with a deeper pitch than a direct drive. Where on a belt drive fan the fan motor shaft has a pulley connected by a belt to a second pulley. Most whole house fans are relatively easy to install. Sizing a whole house fan.

The motors have two bearings whether the fan is direct drive or belt drive. Thus the fan blades will rotate at the same speed as the motor rotates. You have a fan a motor and maybe a coupling. 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.

The second pulley is connected to a shaft that drives the fan propeller.