Forum discussion
NC-2009 IEQp1: Minimum IAQ Performance
If a space is ventilated through an exhaust fan (rate according VRP) and a permanently open vent to the outdoors, can this space be considered mechanically ventilated, 100%OA and can use an Ez of 0,8 if exhaust fan is in the opposite side of the room of the vent?
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Is outdoor air quality testing required in a space using natural ventilation?
What options are available to projects outside the US to meet this prerequisite?
Can LEED 2009 projects elect to follow ASHRAE 62.1-2010 for this prerequisite?
Which units should be included in the calculations for this prerequisite?
Andrew Mitchell, P.E.
PrincipalMitchell Gulledge Engineering, Inc.
LEEDuser Expert
126 thumbs up
September 15, 2015 - 11:24 am
According to Table 6-2, the above would be correct.
Emmanuel Pauwels
OwnerGreen Living Projects
130 thumbs up
September 15, 2015 - 12:07 pm
Thank you Andrew for the quick answer. I had this doubt because from some previous comments seemed that outdoor air should be provided by a supply system in order to consider the zone as mechanically ventilated.
Gustavo De las Heras Izquierdo
LEED Expert181 thumbs up
September 15, 2015 - 5:12 pm
Hi Andrew,
1.Is the project allowed to have operable windows instead of permanently opened vents? Air would infiltrate through cracks and doors.
2.The project will not be capable of providing MERV13 filters. Is the project still eligible to pursue credit IEQc5?
Andrew Mitchell, P.E.
PrincipalMitchell Gulledge Engineering, Inc.
LEEDuser Expert
126 thumbs up
September 15, 2015 - 5:15 pm
1. No, unless they are interlocked to automatically open when the fan is on.
2. No.
Gustavo De las Heras Izquierdo
LEED Expert181 thumbs up
September 16, 2015 - 11:11 am
1.Is this requirement based in a LEED Interpretation or addenda? This would be very helpful in order to explain the client.
2.I agree.