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How to Clean a Furnace Filter

Keep your furnace working as efficiently as possible by following these simple steps.


  • Step 1: Turn off the furnace Turn off the power to the furnace.
  • Step 2: Locate the filter Locate the filter. It may be behind a door and you may need to unscrew a panel.
  • Step 3: Remove the filter Remove the old, dirty filter. Furnace filters simply slide in and out of their housings.
  • Step 4: Wash the filter Wash the filter with a hose until the water going through the filter comes out clear. Then let the filter dry completely.
  • TIP: If the filter has a cardboard frame it shouldn't be washed and should be replaced.
  • Step 5: Reinsert the filter Put the filter back into the furnace, turn on the power to the furnace, and breathe easy.
  • FACT: Furnace filters are rated from one to 20 on the industry standard MERV scale. The higher the number, the higher the quality.

You Will Need

  • Furnace
  • Screwdriver
  • Dirty filter
  • Hose

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