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

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

What if after our Preliminary Review we have to revise 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?

My building has 80 AHUs providing ventilation to building spaces. Do I have to do the ventilation calculations and conduct outdoor air measurements for each one?

Our system cannot provide enough outdoor air due to design limitations. What should we do?

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

The outdoor air intake for our ventilation system is not accessible, and it’s not possible to measure the outdoor airflow directly. How can we determine the outdoor airflow for this system?

How do I find whether my project is located in a non-attainment area for particulate matter or exceeds the prerequisite ozone requirements?

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Forum discussion

EBOM-v4.1 EQp1:Minimum Indoor Air Quality

Fresh Air Requirement

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Pulak Goyal
ESD Consultant
GreenA Consultants
LEEDuser Basic Member
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I have an existing self storage warehouse to be certified under LEED v4.1 O+M Existing Buildings. It has no regular occupants and no regularly occupied spaces. 

Usually the storage spaces are exempt, so does it still need to meet the ASHRAE fresh air requirement? Or is it exempt from the Minimum Indoor Air Quality prerequisite? 

 

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Dave Hubka
Practice Leader - Sustainability
EUA
LEEDuser Expert
510 thumbs up

Wed, 11/29/2023 - 14:08

Active storage is considered to be 'occupied' and would require ventilation.  Inactive storage is considered to be 'unoccupied' and does not require ventilation.  Unoccupied spaces are places intended primarily for other purposes; they are occupied only occasionally and for short periods of time - in other words, they are inactive areas.  I would expect that 'self storage' warehouses do not have onsite staff and thus would be considered inactive storage. They would not be required to be provided with outdoor air.     
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Pulak Goyal
ESD Consultant
GreenA Consultants
LEEDuser Basic Member
0 thumbs up

Tue, 12/26/2023 - 05:57

Thanks Dave for your response. Can I also ask a follow up question -  Is there any minimum area requirement on the spaces which require fresh air? Or do all occupied spaces need to meet fresh air requirement, irrespective of its area and occupancy (eg - a very small office space with 1-2 occupants)?
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Dave Hubka
Practice Leader - Sustainability
EUA
LEEDuser Expert
510 thumbs up

Tue, 01/02/2024 - 14:24

I believe GBCI reviewers will require outdoor air to all occupied spaces - regardless of the floor area or occupancy. (except elevators)

Mon, 07/01/2024 - 11:40

Is there any exemption considering an LEED O+Mv4.1 and existing building, if there is no supply air ir a specific area/space, for instance an open area (reception + lift lobby)? 

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