Bathroom exhaust make-up air and flow

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Zayd

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Hello, everyone. As I continue my basement finishing project, I am planning my bathroom fan location and am hoping to get some simple guidance on how feasible my approach is from an air movement standpoint.

I originally planned to place the bathroom exhaust fan in a conventional location near the shower and toilet. Ceiling height concerns have me evaluating alternatives. Foremost, I don't want to do anything that compromises the purpose of the exhaust. At the same time, if I can achieve an effective exhaust arrangement while saving whatever ceiling height I can, that's the goal. To be clear, I am not installing the fan within the joist bays above, but rather below them due to other equipment in the bays and direction of exhaust.

Option 1 is to accept the lower ceiling and keep the original placement, relying on make-up air coming in from the door gaps:

Option1.png


Option 2 involves moving the fan near the door, reducing the door gaps down to a minimum, and installing a louvered opening in the wall of the bathroom that pulls make-up air from a conditioned adjacent storage room. My rationale is that this new opening would pull from the shower and toilet direction and help move humid/stinky air to the exhaust:

Option2.png


Is this a sensible solution? Or am I rolling the dice on this working?
 

John Gayewski

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Your plan should work if you have the makeup air hole large enough to favor that, rather than the door gap.
 

Reach4

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Suppose you put sheet metal across the bottom of one joist bay, and that joist bay, free of electrical stuff, would be a plenum?
 

Zayd

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Suppose you put sheet metal across the bottom of one joist bay, and that joist bay, free of electrical stuff, would be a plenum?

Great idea except that the joists run perpendicular to the two fan locations. Believe me, I've run through just about every permutation of what is possible. 9" is a lot to lose!
 

Zayd

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The other complication I forgot to mention: I am mounting a Panasonic combination heater/fan, so the heat being close to the shower area is ideal. I am still willing to abandon this fan and remotely mount a fan with shallower ducting to the shower area, as suggested here. That leaves the heater portion to deal with, and perhaps an electric wall-mounted heater is the solution there.
 
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