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  1. #1
    Join Date
    Jan 2010
    Posts
    19

    Help me design a whole house fan which works.

    I bought a home with a damaged ceiling in the center of the living room. I decided to use some spare parts I had to make a whole house fan instead of repairing the ceiling. I used a 18" round hart and cooley supply register, 2' of straight pipe, 25' X 18" insulated flex duct and a old squirrel cage furnace blower mounted in a steel enclosure. Now, this whole house fan works great and it's quiet. My attic is well ventilated. But I had to restrict the old squirrel cage blower since it isn't designed for the existing static pressure. Its also a pain to seal off when I'm using the A/C or furnace. Total cost on the system was $60 for the 18" flex.
    Can anyone recommend where I can find a blower which is designed for the static pressure of about 25' of 18" flex? A insulated damper on or after the blower would then be the icing on the cake.

    Thanks

  2. #2
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,270
    By restricting the air flow through your blower assembly, your blower will work. Get professional help. If you live in a typical green grass climate, caution about sucking in a lot of moisture for the sake of some cooling. You will end up a load of dust mites in the home and mold in the basement. More arrid climates have better results with your concept.
    Wet climates are better off with limited a/c and dehumidification for comfort and indoor qualtity. Especially for basement space which is naturally cool and very comfortable with adequate dehumidification.
    Regards TB
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

  3. #3
    Join Date
    Jan 2010
    Posts
    19
    Thanks Teddy. Quite honestly. Every so called professional Iv invited into my home was a joke.
    Yes I know WHF's are borderline in my area and my A/C does get used more since it pulls only a few more amps than the dated WHF blower. But, on the few select days I want to run it to get fresh air in, I need a better damper at least. A energy efficient VFD blower designed for lower static pressure would also be nice.

    I'm pretty handy. Iv got a sheet metal brake and Iv been thinking about building a damper which uses air pressure and gravity to open and close foam blades or blade.

  4. #4
    Join Date
    Aug 2011
    Location
    Eastern Shore, MD
    Posts
    798
    do you have a gas/oil furnace or water heater?

  5. #5
    Join Date
    Jan 2010
    Posts
    19
    Quote Originally Posted by Gross View Post
    do you have a gas/oil furnace or water heater?
    high efficiency gas furnace. And water heater. Both sealed combustion.

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