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

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? Wou

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 to meet ASHRAE 62.1-2010 due to design limitations. How much outdoor air must we provide to meet Case 2 instead?

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?

What happened to the IEQ Space Matrix that was available to version 2009 projects? What should I reference to determine how spaces in my building should be categorized for this prerequisite?

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EBOM-v4 EQp1:Minimum indoor air quality performance

Operable windows to avoid mechanical ventilation

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Harry Flamm
Senior Sustainability Consultant
Stantec Architecture
LEEDuser Premium Member
20 thumbs up

The home page for this credit, by Ben Stanley, stated below, mentions an alternative reqmn't allowing for operable windows. Can someone elaborate on this for me? I can't seem to find this addendum. Thank you.

"Fortunately for multifamily projects, USGBC released an addendum that provides alternative requirements for naturally ventilated residential units. The alternative requirements focus on providing operable windows in each residential unit, and allows teams required by the ASHRAE standard. See the ventilation calculations exercise to learn more about the information that you’ll need to complete this prerequisite."

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Profile picture for user bstanley
Ben Stanley
Senior Sustainability Manager
WSP - Built Ecology
LEEDuser Expert
188 thumbs up

Thu, 06/14/2018 - 22:45

Hi Harry,  See the updated rating system language for the prerequisite here https://www.usgbc.org/node/5643551?return=/credits/multifamily-existing-buildings/v4. Scroll down to "Multifamily only" under Naturally ventilated spaces. Hope that helps
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Yarai Zenteno
Senior Environmental Consultant
THREE Consultoria Medioambiental
LEEDuser Basic Member
0 thumbs up

Fri, 07/08/2022 - 18:06

Hi,  where it says in the Natural Ventilation for this prerequisite : " Multifamily only In residential units with operable windows, have an operable window in each bedroom. The total openable window area in each bedroom must be a minimum of 4% of the net occupiable floor area or be capable of supplying at least 10 cubic feet per minute (5 liters per second) of outdoor air per person. In each full bathroom, have either an exhaust fan that vents directly to the outdoors or an operable window." Is this for Europe and India only, or could it be a strategy for Central America? 

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