Attic Fan Does Not Run On High Speed

Even at top speed the solar fans only move about half as much air as a conventional electric exhaust fan.

Attic fan does not run on high speed.

Attic fans can sometimes start making noise whether it s humming rattling or making some other annoying noise. The attic fan tends to makes a humming noise when it has a few blades and is running at a high speed setting. You can fix this issue by turning down the settings or checking that the fan is getting enough air. Also make sure the exhaust of the attic fan is high and near the roof with no obstructions.

When running at a high speed setting does the attic fan run hard or sluggishly. These fans do not run nearly as well as a standard electrical attic exhaust fan which can run into the night while trying to cool the attic. One major variable is the venting if you plan on running the fan on high speed most people do you need to make sure that there is at least enough exhaust venting for high speed setting. If it is rotating slowly or not producing a lot of air in the high speed setting you may have a problem with the exhaust or intake.

Check the intake for any debris. In order to get rid of the hum you need to either operate the fan at a low speed or replace the fan with a new one that has more blades. For years since we bought the house 10 years ago when we turned the fan on low it turned on high first before settling on low within a matter of a second or two. A good rule of thumb is to provide one square foot of net free venting area for every 750 cfm.

Whole house fan will only run on high speed i have a whole house fan.