This is a higher quality unit that the vent i replaced.I had to replace my pervious unit after the people who sealed my attic also sealed the vent shut.The local utility contracts attic and house sealing as part of an energy conservation program, your tax dollars at work.I do not know what it will do for my heating bill but they did seal my attic vent closed.
I had to do a lot of adaptation to get a good mount but this may be becuase the people who installed the last one did such a bad job.I had to make a frame and secure it in place and then attach teh vent to the new frame.I made the frame from 1/8" by 1" lath.
The vent baldes are counterbalanced by a spring.The instruction specify that the spring be tensioned to just let the vent close.This is what ai did and in tests both sides closed relaibly.ON installation one sice stays open.Any touch will close them and if I push the vent open with a stick it always closes.Every time the fan wind opens it, it stays open.I suggest you be sure the closure is very secure.I only need it closed at the end of the season, so this issue a mild annoyanceOtherwise it's an excellent product.
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Product Description:
Premium Ceiling Shutter, Gravity Operated, Single Panel, Fits Fan Dia 30 In, Opening Required 29 x 34 1/4 In, Length 30 3/4 In, Width 35 7/8 In
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