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What if after our Preliminary Review we have to re-work the ventilation rate procedure calculations and find that we need to make corrections to the system in order to meet the prerequisite? Can we redo the outside air testing after making corrections? Wo

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Our building has a single fan that supplies outside air to multiple AHU’s. Do we need to perform outside air testing at the supply fan or at all AHUs?

We have a VAV system where single AHUs serve multiple zones. Do we need to take outside air measurements at each VAV box?

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EBOM-2009 IEQp1:Minimum IAQ Performance

VAV minimum for Ds

Hello all, I am completing the 62mzcalc spreadsheet during heating mode. VAV box minimums are typically 30% for systems with reheat. My system is cooling only, so i define my VAV minimums to a value higher than 30% with the largest being 55% to be able to reduce the system ventilation air. Is this an acceptable approach? Also, if a VAV serves 3 rooms and only one of these rooms is my critical zone, and i raise the VAV minimum for example to 40% for this room only to satisfy its ventilation, I will have to input the same VAV minimum (40%) for the other two rooms, even if they do not appear as critical, correct? Appreciate all opinions and advise on this.

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Julia Weatherby
President
Weatherby Design & Co. Engineers
LEEDuser Basic Member
67 thumbs up

Thu, 02/13/2014 - 18:11

I see this is an old post, but will reply as there is no other reply to date. You can define your VAV minimums higher than 30%, but you should be sure you will really run your system that way and it will not over-cool your spaces. Yes, the if the VAV serves 3 rooms and it is set at 40%, then all three spaces will be at 40% for purposes of the calculation, even if all 3 rooms are not critical.

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