Forum discussion

NC-2009 IDc1:Innovation in Design

Innovation in Design - Alternative to Increased Ventilation

What about active air cleaning in lieu of Increased Ventilation. Increased Ventilation only dilutes, but does not remove, VOC's, molds, etc. Especially in a high density urban environment, increased ventilation may actually make the indoor environment worse. Reduced ventilation thru active air cleaning systems both improves the indoor environment and reduces the load on HVAC systems normally required to precondition the outside air. Does USGBC recognize this option???

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Wed, 05/30/2012 - 15:26

Steve, this is not a recognized option for compliance with IEQc2, or IDc1, and while that doesn't mean it can't happen, I see some difficulties.First, LEED does not generally accept an ID credit that is framed as similar to or building on an existing credit. USGBC would just refer you to the IEQc2 requirements.Second, the intent behind what you're proposing is arguably covered by IEQc5, which has its own requirements.However, I would say that you could try it and see how far you get. I would not frame it as an alternative to an existing credit, however. And I would follow the other advice on this page and forum relative to successful achievement of an ID credit.

Wed, 05/30/2012 - 16:13

The difficulty, it seems, is getting LEED to keep up with the technology (be structured for greater flexibility). It is fundamentally bad engineering to use increased ventilation to solve IAQ issues when there is affordable technology to eliminate the contaminants, whether they be dust, mold, viruses, VOC's, smoke, etc. (whethr generated inside, or introduced from outside). Excess outdoor air requires either huge amounts of energy to pre-condition, or additional energy recovery systems to offset that load, but OA doesn't necessarily solve the fundamental problem, especially in an urban environment.

Fri, 06/15/2012 - 20:37

Steve, your most hopeful approach, I would think, would be to submit this by proposing an alternative compliance path within the IEQc2 template, with a detailed narrative to explain, with scientifically-based supporting documentation, how the end result of this process would be directly comparable to the intended outcome of increasing ventilation rates per ASHRAE 62.1. I would also note that you may be redirected by the reviewers to IEQc5; the active-air cleaning you describe seems more comparable to the filtration requirements in this credit as opposed to the intent of the increased ventilation credit. If you need to know if GBCI will go for any of these approaches prior to your certification review, your team can submit for a LEED-Interpretation.

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