The MEP on our project has designed the AHUs to have filters in series for the pre-heat coil (MERV 11) and chilled water coil (MERV 8). Will GBCI recognize these filters in series as greater than the MERV 13 requirement for this credit?

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Dylan Connelly

Mechanical Engineer

Integral Group

LEEDuser Expert

342 thumbs up

Mon, 10/01/2012 - 20:12

April, Good question. The MERV filter ratings are not additive. GBCI will not recognize filters in series as performing to a higher rating. There are still benefits to using filters in series. For one, if you position a lower MERV rated filter prior to a higher rated filter, you can capture many of the particles with a less expensive filter and replace it more often. This will allow you to keep your higher MERV (more expensive) filter for longer without incurring a large pressure drop penalty. Pressure drops when using filters in series ARE additive.

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Combination Filters - MERV 8 & MERV 11

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