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Old May 01, 2010, 11:40 AM
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Las Vegas, NV
Joined Dec 1996
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Well if I were installing that fan in the airplane I'd have the end of the ducting supported by a bulkhead and have a bit of the ducting sticking out past that bulkhead, say 1/8" or probably less, then just mount the fan up against the bulkhead flush, and the slight amount of extra ducting past the bulkhead would slid up into the bellmouth. I like to mount all my fans this way, up against a bulkhead, with that bulkhead holding the rear of the ducting, and mounting the fan on rails, secured with screws. It takes care of the bellmouth problem. If the fan needs to be moved back, short adapters could be made.
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