MERV Rating
Minimum Efficiency Reporting Value — a 1–20 scale for how well a filter captures particles. Household filters typically run MERV 8–13; higher ratings catch finer particles (smoke, allergens) but restrict airflow more, so the right rating depends on your blower and ductwork.
The longer answer
MERV measures particle capture, not air quality by itself — a high-MERV filter that chokes airflow delivers less total clean air than a lower MERV that breathes freely. Static pressure testing during a tune-up answers whether your blower can handle a step up.
The media-cabinet upgrade (4–5 inches of filter media instead of 1 inch) is how you get MERV 13-class capture without strangling the system. Geometry beats density: more surface area means lower restriction at higher capture. See the MERV comparison guide for the 8-vs-11-vs-13 decision with smoke season in mind.
The Seattle angle
For wildfire smoke season, many Seattle systems can step up to MERV 13 — but airflow should be verified first. We check before recommending.
Guides that use this term
Where this decision happens
Nearby in the glossary
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