See all forum discussions about EBOM-v4 EQp1
 Subscribe to new posts about EBOM-v4 EQp1 Post a new question aboutEBOM-v4 EQp1
See LEEDuser’s guidance on EBOM-v4 EQp1»
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 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?

View answers »

Forum discussion

EBOM-v4 EQp1:Minimum indoor air quality performance

Air Class 1 Recirculation

Default Avatar
CT G
LEEDuser Premium Member
19 thumbs up

We're working on a EBOM building, in which the main space is an indoor arena. There are also support spaces around the main arena, such as offices, gym, yoga rooms, etc.

There are 2 AHUs supplying conditioned air to the main space (with a mix of outdoor air, representing 40%, and return air - 60%). 

Since the indoor arena (sports arena or spectators area) is classified as Class 1 air by table 6-1 of ASHRAE 62.1-2010, the building uses the conditioned air of the main space as outdoor air which is supplied to the adjacent support spaces via fans. For the purpose of the OA calculations, we are only taking into account the portion of outdoor air provided by the AHU (40% of total air). 

Example: an adjacent office, with its own VRF indoor unit, requires 20 l/s of outdoor air. We understand that it is acceptable to supply 50 l/s of the main arena conditioned air to the office and that this fulfills the 20 l/s OA requirement per ASHRAE. Is our assumption correct?

The total outdoor airflow rate of the 2 AHUs is enough to comply with ASHRAE 62.1-2010 for all spaces together (arena + support spaces).

Is this approach acceptable by LEED?

0
Post a reply

You rely on LEEDuser. Can we rely on you?

LEEDuser is supported by our premium members, not by advertisers.

Go premium for $15.95  »

Thu, 07/08/2021 - 06:25

Hi CT G, It is accepted by ASHRAE 62.1-2010 to recirculate Class 1 air and use it as outdoor air in other areas. However, I would explain how air is forced into the office, gym and yoga rooms, for example with exhaust fans in these rooms. A different possibility is to request authorization to use LEED Interpretation ID# 10472, which applies to office buildings. You may contact GBCI support to give green light to this strategy. I hope this helps,

Add new comment

To post a comment, you need to register for a LEEDuser Basic membership (free) or login to your existing profile.