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HVAC Filter Finder

Enter your filter size, current MERV rating, and main air quality concern. Get an honest filtration category recommendation — with real compatibility caveats, not unsupported engineering claims.

Direct Answer

MERV 8 is the standard baseline for most residential systems (pollen, dust mites, basic dust). MERV 11 captures finer particles including pet dander and mold spores. MERV 13 provides near-HEPA performance for fine PM2.5 — but increases airflow restriction and must be verified compatible with your specific HVAC system.

Important: This tool recommends a filtration category, not a specific engineering conclusion. HVAC compatibility depends on your system's fan/blower, duct design, and specific filter housing — always verify with your HVAC documentation or technician before installing a higher-MERV filter. 1-inch and deep-media (4–5 inch) filters at the same MERV have very different pressure drop characteristics.

Filter Size

Current Filter & System

Check filter label, system manual, or existing filter packaging.
Check your system manual, filter door label, or ask your HVAC tech.

Main Air Quality Problem

How this tool works: Recommendations are deterministic logic based on MERV standard particle capture efficiency ranges (ASHRAE 52.2), filter depth considerations, and general HVAC compatibility guidance. This tool recommends a filtration category — it does not make HVAC engineering conclusions about your specific system. Pressure drop varies significantly by filter brand, pleat design, filter size, and system airflow. Always verify compatibility with your system documentation or a licensed HVAC professional before installing a higher-MERV filter.