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QUESTION:Does the air flow (and thus the air filter) for forced hot air furnace go in the same direction for heat & air
I know that the arrow on the filter must face the same way as the air flow, but don't know if the air flows into furnace or out of furnace at the point where the filter is placed. Also think maybe it is different when I run the air than when I run the heat. I am getting cold...I need an answer.
ANSWER: You can test it easily enough. Turn on the system, then hold a paper napkin or something similar in the opening where the filter goes. see which way the airflow pulls the paper.Most furnace filters are placed at the front of the system (where are flows in) to protect motors and fans from getting dirty. Placing a filter element at the output end could potentially be a fire hazard. There should be no difference between the filter when setting to hot or cold.
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