I am currently working on a project that has a dual HVAC system. A Daikin mini split ductless system and a DOAS Desert Eir system with ducts & filtration. We would like to start up the Daikin ductless system only to increase building temperatures for installation of carpet system. However, due to the design of the units - MERV 8 filtration would put too much strain on the systems. Can we still use these units during the construction phase and still quality for for IAQ during custruction credit?
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Allison Beer McKenzie
Architect, Director of SustainabilitySHP Leading Design
LEEDuser Expert
646 thumbs up
December 20, 2011 - 1:17 pm
Sharon- reviewers have been very specific in the past that MERV 8 filters must be used if permanent HVAC systems are used during construction. You could consider using temporary heating systems to increase the temps and still be eligible for the credit.
Sharon Morris
24 thumbs up
December 20, 2011 - 3:03 pm
Thanks Allison for your reply. It seems the intent of using MERV 8
Filters in permanent HVAC would be to prevent contamination of the ductwork. The daikon system units are permanent but are non-ducted. They are essentially super efficient space heating & cooling devices.
To bring in space heaters would be extra labor, gas, travel... Which seems to defeat many goals of LEED. There is filtration in the daikon units but no where close to MERV 8 rating. Any other ideas of who I could contact at USGBC to review this specialized system? Thanks again for your comments & suggestions.
Robert Sutton
P.E., C.E.M, President/OwnerSutton Engineered Systems, Inc.
March 5, 2013 - 11:59 am
Sharon - did you ever get an answer. I too am looking at a VRF type system using the mini systems for my spaces or zones and a DOAS unit for the fresh air component. The DOAS will have filters since it is ducted but may not be able to handle MERV 8. The zone located units would not have but a small filter that is not MERV anything I think.
We need an answer on this one. Let me know please.