Allergy relief

HEPA vs MERV Filters: What's the Difference and Why It Matters for Your HVAC HEPA and MERV describe two different ways of measuring filtration. MERV is a 1 to 16 scale used for HVAC filters in ducts and air handlers. The higher the MERV, the better the filter is at catching smaller particles. HEPA is a separate standard that exceeds MERV 16 performance, designed for extremely high single pass effi ...