Openings in air intake duct on central HVAC system
I cannot think of any good reason there would be that type of opening in your ductwork, unless your return ductwork is undersized, or just an oversight by the installer.
If you are drawing return air from an enclosed space with other gas fired equipment, the negative pressure may cause a downdraft, which would not be good.Try covering it and see if it effects the performance of the AC.. Watch for frosting on the larger of the two pipes to the air handler, and see if it effects the airflow to the rest of the house.
That has to be costing you a fortune, drawing hot air from the attic...not good.
Look forward to hearing more.
Last edited by 8 Ball; 07-02-2008 at 09:55 PM.