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NC-2009 IEQp1:Minimum IAQ Performance

IEQ p.1

Hello, I am working on a residential building oversees seeking LEED Silver (V3). To comply with IEQc.5 we are installing MERV 13 filters on all fresh air intakes. Would we still need to install MERV 6 filters on all fan coils to satisfy ASHRAE 62.1 - 5.9 and therefore IEQp1? isn't redundant since the air is already filtered through the MERV 13 filters?

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Thu, 12/13/2012 - 19:51

Adam, ASHRAE 62.1 Para. 5.9 only applies to coils that serve occupied spaces. In order to comply with IEQp1, all Fan Coils serving occupied spaces must be filtered with a minimum of MERV-6. In order to achieve IEQc5 they will need MERV-13 filters. This is only for occupied spaces. If not occupied then there is no requirement but filters are highly advised. Also, this is not redundant because you should be filtering all return air as well as ventilation air. Otherwise there is no way to remove airborne contaminants originating inside your space.

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