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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

What if our systems do not meet the required outside air when systems are tested at worst-case conditions?

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

ASHRAE 62MZ calculator

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Mark Frey
Senior Consultant
Lemon Consult AG
LEEDuser Basic Member
28 thumbs up

I try to fill out the ASHRAE 62MZ calculator and have some problems with it: 1) We have lots of AHUs in our building (Some Vanitlation systems, some AC-systems and some are only exhaust systems). Do I have to do a calculation for each of them (72 in total)? 2) Is it right, that I have to enter one spreadsheet for each AHU, but not for all zones, only the critical ones? Then I only get the required OA to transfer them to submittal form in LEED online under "Table. Ventilation Air Flow Summary" for the critical zones and not for all areas. Is this right? 3)If I have filled in the spreadsheet 62MZ calculator, do I also have to fill in the table in the Appendix IEQp1-A3. Mechanical Ventilation 100% OA? 4) Is there a spreadsheet for natural ventilationas we have more than thousand of natural ventilated rooms and can't fill them in the template. Would it be possible to upload a excel-sheet because of special circumstances? Thank you very much for your help!

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Ben Stanley
Senior Sustainability Manager
WSP - Built Ecology
LEEDuser Expert
188 thumbs up

Wed, 01/18/2012 - 16:11

Here are some ideas. 1. Any system that is providing outside air into occupied spaces needs to be included in the calculations. Generally exhaust systems are not included but one exception would be if the exhaust system is the sole source of outside air into a space. 2. Yes, you need to do a separate 62MZ spreadsheet for each system. Only potentially critical zones need to be included in the spreadsheet but you will also need to complete the "Inputs for System" section of the spreadsheet, which allows the calculator to determine the outside air required for the entire system, not just the critical zones. This value for required outside air, for the entire system, is then transferred over to the LEED submittal form. 3. In version 4 of the submittal form, there is a check box to select to complete the ASHRAE 62MZ calculator. Checking that box will automatically pull up the table that needs to be completed on the form. You don't need to complete the table in the submittal form appendix if you do the 62MZ calculators. 4. With the version 4 form select the check box that indicates you have areas served by natural ventilation. Then you will need to complete the natural ventilation table in the submittal form appendix.

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