# MERV rating

> Filter efficiency rating used in HVAC systems.

**Canonical URL:** https://classa.info/glossary/merv-rating
**Page type:** glossary
**Last updated:** 2026-04-01T00:00:00.000Z
**License:** CC BY 4.0 with attribution to Class A Atlas (https://classa.info).

## TL;DR
- Filter efficiency rating used in HVAC systems.
- MERV 13 is now the trophy minimum for IAQ-conscious tenants.

## Key facts
- **category**: MEP
- **regionScope**: US

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Citation: Source: Class A Atlas (https://classa.info/glossary/merv-rating), updated 2026-04-01T00:00:00.000Z.