The attic fan tends to makes a humming noise when it has a few blades and is running at a high speed setting.
Noisy roof exhaust fan.
These are located in the track where the pipe coming out of the roof meets the spinning part of the vent.
Attic fan making humming noise.
I would first check to make sure the noise isn t coming from a bent out of balance fan blade or loose screen mesh or dome cap that is vibrating.
Place the stepladder under the attic access space.
Remove the old vent.
Our turbine roof vents whirlybirds were really noisy and had some rattling that was causing some vibration in the house.
Due to regular wear and tear these bearings can become worn out or lose their lubrication ability.
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.
Often a stiff wind will open vent dampers causing them to periodically clang shut.
Remove the screws holding the vent in place.
We live in a windy area and the flabber doors on the fans are often banging open and shut.
If the noise drives you crazy new spring loaded backdraft dampers 9 to 30 depending on the size should solve the problem.
Cut through any sealer that may be present.
Lift up the edges of the surrounding roof shingles so you can see the edges of the vent.
Some of this noise can be reduced by adding a flexible insulating padding layer between the fan s mounting flange and the roof sheathing to absorb some or most of the vibration and sound.
Tighten the fan s mount and other loose parts.
The mount can become loose especially on fans that are installed on the roof.
This is a fan that ventilates 3 of the 30 apartments on my floor.
Climb the ladder remove the access panel and enter the attic.
In january 2011 i noticed a loud noise from one of the roof fans located above my bedroom.
This can cause the fan to start making constant noise and in some cases even a loud squealing sound.
It was very annoying.
I contacted apartment service and they told me that they just changed the fan belt on the roof ventilation fan and that the belt needed to break in.
This is actually the most common noise issue with attic fans.
Find the noisy turbine and apply the lubricant to the moving parts of the turbine.
Attic fans also have small ball bearings that help lubricate the fan s movement.
The other option is to call the manufacturer or the store where you bought the attic fan and see if they have any available for the exact model you have.
The noise is annoying but i m also concerned about the heat loss in the winter.
Remove the current worn out bearings and replace them.
Be sure to lubricate the bearings.
Climb onto the roof and locate the vent that is causing the noise.
Typically it is impractical to attempt.
