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Wow, that's a biggie! I installed a 30" variable speed direct drive Sears whole house fan with shutters in my house 31 years ago & it's still going strong! That thing makes mine look tiny! Hell, my "dinky" little fan can suck the pilot out on my furnace in the basement as it is. That monster could probably suck the windows in! Nice score!!!
These are great to cool the house at night, then close it up all day. Saves on the A/C bill for sure! I have a small Dayton fan with shutters ( 12-16") that makes a huge difference in my little shack.
Mike