Exhaust fans should have dampers to prevent intrusion of air when the fan is not running.
Originally Posted by Canadaq
Is it possible air being exhausted from a balcony near yours contains cooking odors that are being ingested by your ERV?
Building Physics Rule #1: Hot flows to cold.
Building Physics Rule #2: Higher air pressure moves toward lower air pressure
Building Physics Rule #3: Higher moisture concentration moves toward lower moisture concentration.