How to Change the Filter in Your Furnace
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Slide out the old filter.
The filter should slide out easily. If there’s any resistance as you pull, check to make sure that there is a locking mechanism holding it in place. If so, slide the lock out of the way and it should slide right out.
Disposable furnace filters have a cardboard frame. If your filter has either a plastic frame or a metal one, stop here. It is a permanent filter and can be cleaned and reused instead.