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Can the air sucked out by an exhaust fan from a room go back in through an open window on the second floor of the house? - Quora
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Before - exhaust fan installed upside down, blowing air into bathroom instead of out of bathroom | Bathroom makeover, Exhaust fan, Installation
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Amazon.com: Inline Duct Fan 4 Inch Vent Booster, HVAC Exhaust Intake Fans 76 CFM, Ventilation Blower for Grow Tent Attic Kitchen Garage Greenhouse Basement (Φ 4 inch/110v) : Patio, Lawn & Garden
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SAILFLO 10 Inch Exhaust Shutter Fan 2-Way Linkage Blower 470 CFM Strong Reversible Airflow Wall Mounted Ventilation Fan for Vents Attic Kitchen Bathroom Basement 10" Diameter Propeller - Amazon.com
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