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NC-2009 IEQc5: Indoor Chemical and Pollutant Source Control
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Combination Filters - MERV 8 & MERV 11
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Dylan Connelly
Mechanical EngineerIntegral Group
LEEDuser Expert
472 thumbs up
October 1, 2012 - 4:12 pm
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.