Step 2 of 5 · How Your Home Heating System Actually Works
Return air and the filter
Return air and the filter — step 2 of 5 in How Your Home Heating System Actually Works. Cool room air is pulled into return grilles → return duct → filter → blower. Filter protects the heat exchanger and your lungs' air path.
Free home & diy tip: Return air and the filter (step 2 of 5 from "How Your Home Heating System Actually Works").
Cool room air is pulled into return grilles → return duct → filter → blower. Filter protects the heat exchanger and your lungs' air path.
Open the filter slot (power off if you're nervous). Read size printed on the frame. Clogged = weak airflow and higher bills.
Pro tip: Buy a 3-pack of the exact size — write install date on the frame with a marker.
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