How to Change a Furnace Filter
Installing a Vapor Barrier in Your Crawlspace
How to Inspect the Blower-Fan Belt on a Furnace

How to Change the Filter in Your Furnace

Step 3 of 3
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Replace the filter with a new one.

Make sure you get the exact same size (the measurement is printed on the edge of the filter) and make sure that the airflow arrows on the side are pointing the right way (toward the blower and away from the cold air).

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