And here s how.
Older theatre designs place the return air vent for the air-handling unit behind the screen.
Think of how many cubic feet of air passes through the screen each day. That air may contain dust, dirt, pollution and smoke. The theatre screen acts as an imperfect air filter for these contaminates. Matters are made worse when the air filters are not changed in a timely manner. Excess pollutants circulate through the auditorium.