Make up air inlet duct is to small and to many bends.... Same rules apply for make up air as exhaust, large diameter tube (should be same size as exhaust), minimal bends ... Though its NOT pressurized by fan, its still a "static pressure" issue (resistance to air flow)...
Wonderful thing about nature is, it abhors a vacuum and will try to fill it from outside pressure and it will take path of least resistance (door/window)...
Dale
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San Francisco - A Few Toys Short of a Happy Meal
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