Hot answers tagged exhaust-fan
2
I don't know about code compliance. But, this might work for you:
1 Y-Connector at the outside vent.
2 Backdraft Dampers (one on each leg) at the Y to stop the backflow of noxious gases from one fan(on) to the other (off).
Note that the backdraft dampers will add to the resistance of the duct work. You may wish to move up to the next size of duct.
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1
Most wall mount ventilation fans are intended to go thru an exterior wall to a cap.
Your plan will work, if you make allowances to support the duct away from the wall a bit, to make the initial turn down. Use smooth duct and metal tape for sealing duct sections.
update Be sure to slope all horizontal runs of the duct such that they will drain any ...
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