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CI-2009 IEQc5: Indoor Chemical and Pollutant Source Control
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MERV13s on VAV boxes
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Dylan Connelly
Mechanical EngineerIntegral Group
LEEDuser Expert
472 thumbs up
July 24, 2012 - 7:58 pm
VAV boxes themselves do not need the MERV 13 filters. However, there needs to be MERV 13 filters on the Outside Air Intake of the air handling unit serving those VAV boxes in order to comply.
Check with the building engineer.
Michelle Rosenberger
PartnerArchEcology
522 thumbs up
July 25, 2012 - 11:26 am
Thanks, Dylan. The building engineer is checking with us.
Dylan Connelly
Mechanical EngineerIntegral Group
LEEDuser Expert
472 thumbs up
July 25, 2012 - 11:37 am
To elaborate: Ask the building engineer if they use MERV 13 filters on their Air Handling unit that is serving your space's VAV boxes.
If not they need to start using them or you don't qualify for this credit. Adding MERV 13 filters to each VAV boxes is not standard practice and would require a lot of maintenance and expense.
Also to clarify, usually the filters in the AHU are located after the OSA and RA mixing box and before the coil(s).
Michelle Rosenberger
PartnerArchEcology
522 thumbs up
July 25, 2012 - 11:48 am
Thanks, we already know the AHUs have it and the VAV boxes are capable of taking them. Since VAVs do recirculate some small percentage of the return air and obviously filtering the outside air alone is not enough for the intent of this credit, we just haven't been able to ascertain through a review process 100% for sure (or as close as you can ever get), how this "return air filtering" is defined. If we only need to filter the outside air and the portion of the return air that is being re-distributed through the AHU, then we're fine. Thanks.
Dylan Connelly
Mechanical EngineerIntegral Group
LEEDuser Expert
472 thumbs up
July 25, 2012 - 11:58 am
Ah Fan power VAV boxes. Per the latest addendum (4/1/12) only units that are processing Outside Air need to have the MERV 13 filters. Recirculating units do not.
You are fine.
Here is the new credit language:
“Particle filters or air cleaning devices shall be provided to clean the outdoor air at any location prior to its introduction to occupied spaces.”