Furnace filter size
20x25x5 air filter
A 5-inch media filter. Honeywell and Lennox both sell 5-inch filters in this size for their own media cabinets.
- Nominal size
- 20x25x5
- Usual actual size
- Per cabinet
- Thickness
- 5 inch
- Change it
- Every 6 to 12 months
5-inch media filters are built for one cabinet design, so the actual size depends on the cabinet maker. Match the size printed on the old filter or the cabinet door.
Which MERV to pick
Most 5-inch media filters are MERV 11 to 16. Buy the one made for your cabinet: the maker and model are on the cabinet door or the old filter.
How often to change it
Every 6 to 12 months is a good start for a 5 inch filter. Pets, allergies, a remodel or wildfire smoke shorten it; a filter that has turned grey is due whatever the date.
Buy this exact size
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20x25x5 questions
What is the actual size of a 20x25x5 filter?
5-inch media filters are built for one cabinet design, so the actual size depends on the cabinet maker. Match the size printed on the old filter or the cabinet door.
How often should I change a 20x25x5 filter?
Every 6 to 12 months is a good start for a 5 inch filter. Change it sooner with pets, allergies, construction dust or wildfire smoke, and whenever it has turned grey.
What MERV rating should a 20x25x5 filter be?
Most 5-inch media filters are MERV 11 to 16. Buy the one made for your cabinet: the maker and model are on the cabinet door or the old filter.
Can I use a 20x25x1 instead?
Not in a 5 inch cabinet. A 1-inch filter leaves a gap that lets air go around it, so the dust skips the filter. Match the thickness printed on your current filter.
Get a text when it is due
Free. We will text or email you when this filter is due, with a link to this size.