whole house fan louvers won't open

fuse (or worse?). The traditional whole-house fan is fairly large and noisier than small fans, but can move between 4,000 and 7,000 cfm of air. I installed one of these fans in a house near Chicago, and frankly, the overall insulation of the house was poor enough that there would be no point to insulate just one 2x2 foot bit of the ceiling. In order to achieve cooling in these hot, humid climates (imagine a night that stays hot and sticky all night long) the air must move fast enough to create evaporative cooling on the skin (like a fan blowing right on you on a hot day). It moves cool air in and moves hot air out at the same time. The fan is stationary and is typically attached to ceiling joists or a frame built to support the fan and its motor. ... it won't >> open the louvers I think, which are just sucked open. Usually the heavier the fan and louvers, the less of a problem this will be. Re: Whole house fan - possible to add variable speed? Whole house fans pull the air into your house and through any available open windows. However, it is also a superior, powerful air circulation method. We have recently purchased an older home, built in 1931. There are also insulated caps that can be slipped over the louvers for added insulation in the winter. The louvers on the whole house fan won't stay open. Open windows if the shutter rattles. Louvers open when the fan is running and close to seal the hole when it is not. Traditional whole house fans were popular in the 1950s, before A/C was common, mostly in the South and Midwest. Whole house fans may also be installed in walls or on rooftops for homes without an attic. This type of fan is installed in the ceiling, and louvers open when the fan is turned on. When we measure the shutter cover in place now we get odd measurements. We do not know when the fan was installed or who made it - however, it is a very large whole house fan - 42" blades with 46" frame. Most whole house fans tend to be 24 or 30 inches. We were told to replace the shutter. They then push it out through your attic forcefully. I have a 36" whole house fan in the eave with a screened louver in front of the fan and a draft operated register in the ceiling in the center of the house. Whole-house fans usually have automatic louvers. Now the problem is we don't know how to accurately measure. While there are many different types and styles of these fans available in the marketplace, if you are looking to purchase a whole house fan – consider investing in a system that is whisper quiet, easy to install and requires no maintenance. It makes too much noise and you won't be able to sleep. Also if a whole house fan gets too slow, it won't open the louvers I think, which are just sucked open. The fan works great if we prop the louvers open. So that tells me the #'s are about right and that I need at least 7-8sf of add'l vent space. They also rattle a bit. More air helps the shutters open all the way. Newer whole-house fans are available that have a flow range between 1,000 and 3,000 cfm. The fan is as far as possible from the bedrooms. There is a belt-driven whole house fan in the attic that we would like to get working again. If I open the attic access panel, the louvers open fully and its noticeably quieter. As far as performance, I notice the fan's louvers (in the living space) open about halfway when the fan is on. Make sure there is at least 30 inches of clearance above the blades of the fan, or air will be forced back through the shutter. Access panel opening is ~7.5sf. Do not put the fan in the bedroom. Using a whole house fan is a cost effective and efficient way to cool your home. Like a box unit or a ceiling fan, a whole house fan cools down your house. Re: Whole house fan - possible to add variable speed? The motor is not the problem. 24 or 30 inches hole when it is not accurately measure to be 24 or 30 inches # 's about. 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