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Some examples of MERV ratings

§ 95% or MERV 14 — typically applied as the final filter in hospital HVAC systems.

§ 85% or MERV 13 — typically applied in above average commercial applications.

§ 65% or MERV 11 — applied in standard commercial buildings, such as office space.

§ 25% or MERV 6 and 7 — pleated panel filters, applied in office environments, and as prefilters.

§ <20% or MERV 1 through 5 — typical polyester or fiberglass throwaway panels and metal washable filters.