Suggest an editFor: How to Change a Furnace FilterLeave this empty What version are you on? (for example Windows 11 24H2, macOS 26, iOS 18, Chrome 140)Which step?1. Turn the furnace off at the service switch2. Find the filter slot3. Read the size printed on the cardboard frame4. Point the arrow toward the blower5. Choose a MERV rating the system can handle6. Set a replacement interval and write the date on the frameA step is missingSomething else on the pageWhat should it say?Screenshot (optional, up to 4 MB)Your email (optional, only if you want a reply)Send suggestionNo account needed. Suggestions are reviewed before anything changes on the site.