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-   -   whole house fan louvres don't open (http://www.diychatroom.com/f17/whole-house-fan-louvres-dont-open-27148/)

edunbar42 09-21-2008 01:56 PM

whole house fan louvres don't open
 
A few months ago my whole house fan worked nicely, but now it doesn't. The fan runs at its usual noise level, but the louvers in the attic floor/ hall ceiling don't open. When I push them open with a broomstick, they immediately fall closed again when I remove the broomstick. How do I fix this?

TazinCR 09-21-2008 02:00 PM

They may have a helper spring or cylinder that has broken or came loose. Do they move freely?

Termite 09-21-2008 02:13 PM

TazinCR's right I'd imagine. I'd take the louvers down and check the springs on them. If one broke or came unhooked, the fan probably can't pull them open.

Marvin Gardens 09-30-2008 12:36 PM

There are different types of vents. Some a bariatric that open with pressure (or negative pressure in this case) and some need assisting with springs or power as is the case with powered vents.

Then again it could be that you have another opening in the attic and the air is coming in from there.

Go up in the attic and look around. Maybe you have a broken attic window that won't allow negative pressure to build up and open the vents in the ceiling.


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