Detach the fan from the power source.
Reduce attic fan vibration.
The attic fan tends to makes a humming noise when it has a few blades and is running at a high speed setting.
Attic fans also have small ball bearings that help lubricate the fan s movement.
If this does not stop the noise then slide a washer over the screw so it will be positioned between the screw and the fan.
Turn the power back on to help dry the blades and see if the fan still vibrates.
A newly installed attic fan vibrates.
If it s an electric fan turn the mains off.
Attic is 1 500 sqft.
A gable attic fan is attached to the attic wall by screws and if they are loose the vibration can cause an awful noise.
Crappy fan or improper mounting.
Feel the drywall inside the home that is closest to the fan location for vibration.
A significant amount of that cooling is likely to come from conditioned air being sucked up from the house below.
Before inspecting individual parts of your attic fan and fixing anything make sure that the fan is detached from its power source.
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.
You need to secure the screws in place more tightly by rotating the screwdriver clockwise.
Clean all the fan blades with a damp cloth then dry them off with a clean dry cloth.
1 5500cfm attic fan with thermostat and humidistat.
Due to regular wear and tear these bearings can become worn out or lose their lubrication ability.
If you feel any vibration of building components you can be sure it is being transferred back into the building.
If the fan itself is touching any building components adjust the fan supports so it does not do this.
Remove the current worn out bearings and replace them.
That is i said that when you run a power attic ventilator in a typical house yes it will cool the attic down.
One reason power attic ventilators don t help in my original article i focused on makeup air.
Manufacturer airvent inc model 53850 suggested use up to 2100sqft.
The lateral deflection is minimal think back massager not a ceiling fan with one blade.
This can cause the fan to start making constant noise and in some cases even a loud squealing sound.