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Furnace Filter Size Finder

Find the right filter dimensions and MERV rating for any furnace or return grille.

Result

Recommended size

20 × 20 × 1 in

MERV rating

MERV 8

Fit quality

Exact match

Replacement cycle

Every 60–90 days

About this tool

Type your existing filter's dimensions or the return grille width × height. Get the standard nominal size, MERV rating guidance for allergies vs. pets, and a printable replacement reminder. A direct response to the recurring r/hvacadvice and r/HomeImprovement 'what size filter do I need' question.

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