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Unread 03-11-2021, 07:41 AM   #39
ss3964spd
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Using a single fan to pull air from two different locations and exhaust it through one outlet is a different scenario than using two fans to exhaust through one outlet. You use two plenums, one in each space, and the fan is located down stream of both. When the fan is on it is pulling from both. If both plenums are the same size, and so too are the ducts, the fan is going to draw more air from the plenum that has the least restriction; the one closest to the fan, unless the make up air is restricted.

Note the exhaust outlet on that Panasonic inline is 4". Anything less than that and it will not achieve its rated CFM.
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