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Filter Finder · Free Tool

Air Filter
Size Finder

Enter your filter dimensions to find the correct replacement size. Standard and custom sizes with MERV rating recommendations.

Finding the Right Air Filter

The wrong filter size lets unfiltered air bypass around the edges, while a too-tight filter restricts airflow and strains your blower motor. Measure your existing filter or filter slot to get the exact dimensions.

MERV Rating Guide

MERV 8: Basic protection, budget-friendly. MERV 11: Good for homes with pets. MERV 13: Captures allergens and some viruses. Higher MERV = better filtration but more resistance — make sure your system can handle it without high static pressure.

FAQ

How often should I change my filter?
1-inch filters: every 1-3 months. 4-inch media filters: every 6-12 months. Homes with pets or allergies should change more frequently. A dirty filter is the #1 cause of HVAC problems.
What MERV rating should I use?
MERV 8-11 for most homes. MERV 13 for allergies or asthma. Don't exceed MERV 13 unless your system is designed for it — high MERV filters can restrict airflow and damage equipment.

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