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FAQs about EQp1 :

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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EBOM-v4.1 EQp1:Minimum Indoor Air Quality

Minimum OA Options

Hello,  I have a site that has a shared OAD for two units.  The duct is not large enough to supply the minimum OA, and one of the spaces have changed usage.  Even with reduced CFM per occupant based on units that can't meet the minimum we are still short.  Replacing the units and inlarging the ductwork is not an option.  Will this cause the section to fail?  Are there any suggestions on what can be done?  

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Profile picture for user Dave.Hubka_2
Dave Hubka
Practice Leader - Sustainability
EUA
LEEDuser Expert
510 thumbs up

Sun, 02/25/2024 - 01:14

The v4 language allows a path when 62.1 vent rates cannot be met..."If meeting the outdoor airflow rates in Case 1 is not feasible because of the physical constraints of the existing ventilation system, complete an engineering assessment of the system’s maximum outdoor air delivery rate. Supply the maximum possible to reach the minimum setpoint in Case 1 and not less than 10 cubic feet per minute (5 liters per second) of outdoor air per person." The LEED v5 Existing Building reference guide draft states "Compliance with minimum outdoor rates is highly encouraged but not required for this prerequisite." I wonder if you could wait and submit this project through v5 once it becomes available? Otherwise run the project through v4 if you can provide at least 10 cfm of outdoor air per person.  Hope this helps!

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