If they spin freely but just sit there when on your roof i d say they aren t level.
Roof turbine vent stopped spinning.
Put a hole in the roof and the hot high pressure air will move outside to equilize pressure.
Find the noisy turbine and apply the lubricant to the moving parts of the turbine.
It was very annoying.
Be sure to lubricate the bearings.
Climb up and take a good look at the turbine vents from the inside.
If the vents are blocked by insulation boxes or other obstructions heat will not be able to escape through them and they will not spin.
In addition pay attention to the maximum roof pitch that will work with the turbines.
You can usually adjust the level by turning the turbine body.
In fact when i was headed to the last vent i noticed the the others were spinning on their own quietly with only the slightest hint of wind wafting by.
These are located in the track where the pipe coming out of the roof meets the spinning part of the vent.
Place the stepladder under the attic access space.
I ambled around the roof shooting wd 40 specialist spray stay gel lubricant into all the vents getting them spinning smooth and easy.
The turbines are adjustable so that the spinning part is level even though the roof is slanted.
Since they are only 4 years old i m guessing they were replacements so maybe the wrong ones were installed not all turbines work with all roof pitches or these just haven t been leveled correctly.
The vents may have obstructions such as insulation or boxes or some other material.
Climb up into your attic and look at the vents from the inside.
If it did then it s as if you had some sort of a perpetual motion machine.
If you decide to add more turbine vents to your roof be sure to buy ones that are aluminum.
Not all turbines will fit all roof pitches.
These will not rust.
Clear away any debris or insulation blocking the vents to re activate the spinning turbine.
Put a roof turbine on that hole it starts spinning but it is blocking the flow of air to the outside not speeding it up.
