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NC-2009 IEQp1:Minimum IAQ Performance

Minimum Indoor Air Quality Calculation (Natural Ventilation)

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JP Rout
LEEDuser Basic Member
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We are pursuing for Fresh Air calculations for a Building with Natural Ventilation, as per the ASHRAE 62.1-2007 requirement, stated under the IEQ Prerequisite 1 – Minimum Indoor Air Quality Performance. Few Zones in the Building have openable windows and also comply as per the 4% (Openable Area/Carpet Area) requirement. The Project has used a combination of exhaust fans and doors to comply the requirement, as per the local code. Following are my queries: 1. Will installation of ceiling fans/exhaust fans help to achieve this credit? If yes, is there any specification for the fans? 2. Are spaces like Corridor, Foyer, Pantry, Electrical/Mechanical room and IT room to be counted as occupiable spaces and should Fresh Air calculations be done for these areas? Kindly advice and thanks in advance.

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Thu, 04/17/2014 - 15:01

JP, first of all, if I understand you correctly, most of your zones do not meet the natural ventilation requirements. This will be a major problem with achieving LEED certification. If you do not comply with the prescriptive requirements then you will need to show mechanical ventilation. You can do this with an exhaust fan by pulling in make-up air but you effectiveness will be 0.5. You need to make sure that the air is 100% OA. As for the second question, I would consider all of those to be non-occupied spaces with the exception of the foyer. Most foyers are not a separate room but are part of a living area. If it is separate then you may try to consider it non-occupied.

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