Dear All,
We are working on a 6 storey residential project which pursues LEED certification under the BD+C: New Construction rating system.
According to the concept design, dwelling units will be naturally ventilated with VRF heating and cooling. As stated on the LEED reference guide and ASHRAE 62.1 2010, section 6.4, naturally ventilated spaces are required to include a mechanical ventilation system unless one of the following exceptions applies:
· Ventilation openings comply with Section 6.4 and are permanently open.
· Ventilation openings comply with Section 6.4 and have controls that prevent them from being closed during times of expected occupancy.
· The naturally ventilated zone is not served by heating or cooling equipment.
· The system is an engineered natural ventilation system approved by the authority having jurisdiction
Neither the above exceptions are feasible for our project’s dwelling units (and I am assuming for the vast majority of the project containing dwelling units as it wouldn’t be acceptable and appealing from the future buyers and/or tenants) nor installing fresh air ductworks is feasible in technical terms due to lack of space, etc.
Therefore, I would like to ask you whether dwelling units can be exempt from this requirement and only demonstrate compliance with ceiling heights, opening sizes, etc.
Thank you in advance.
Aris
Fotis Kotsopoulos
January 27, 2022 - 6:19 am
Aris, residential projects subject to 62.2 Std "Ventilation and Acceptable Indoor Air Quality in Residential Buildings" requirements.
Aris Koliopoulos
Sustainability ConsultantDCarbon
January 27, 2022 - 6:34 am
Hi Fotis and thanks for your response.
So, is the project subject to ASHRAE 62.2 requirements even though LEED BD+C New Construction requirements apply which only refer to 62.1 manual?
Is there an official guidance from GBCI that we can use 62.2 instead of 62.1?
Kind Regards,
Aris
Anne Caminade
Project managerLemon Consult
3 thumbs up
January 28, 2022 - 11:19 am
Hi,
I am in a similar situation to Aris who started the discussion, where we have a mixed used development with a few apartments on the top floor and we are undergoing a LEEDv4 Core and Shell certification (speculative office on the first 4 floors).
So...just like Aris asked above, I would like to know if the residential part of the project is subject to ASHRAE 62.2 requirements even though it is LEED BD+C (not LEED Homes) or should we stick to ventilation rates from 62.1 (Table 6.1, min OAR for dwelling units)?
Is there an official guidance from GBCI that we can use 62.2 instead of 62.1?
Thanks a lot (this is pretty urgent...)
Kind regards,
Anne
Frantisek Macholda
Sustainability ConsultantEkoWATT
January 28, 2022 - 12:27 pm
Hello Aris & Anne,
did you consider to use European ACP? I would try to consult it with USGBC. I am aware that this is a residential project and the ACP is related to non-residential buildings but the response could be very fast.
Good luck!
Frantisek
Dave Hubka
Practice Leader - SustainabilityEUA
LEEDuser Expert
525 thumbs up
January 28, 2022 - 1:00 pm
LEED Interpretation 10416 states that ASHRAE 62.1-2013 can be used in lieu of ASHRAE 62.1-2010.
ASHRAE 62.1-2013 Addendum a, and the corresponding ASHRAE 62.2-2013 Addendum g place all dwelling units with non-transient occupants under the scope of ASHRAE 62.2-2013. Therefore, should the project team choose to apply this approach, all residential dwelling units may be documented as complying with ASHRAE 62.2-2013, and all other spaces may be documented as complying with ASHRAE 62.1-2013.
hope this helps.
Aris Koliopoulos
Sustainability ConsultantDCarbon
January 31, 2022 - 4:44 am
Hi David,
Many thanks for your response which seems to be solving the issue we had. My only concern is that there is no specific guidance as of which sections of ASHRAE 62.2 2013 exactly a naturally ventilated dwelling must comply with. For example, LEED reference guide explicitly refers to section 4 of ASHRAE 62.1 2010, is there a similar guidance for 62.2 2013?
For example, to my understanding section 4 (Whole-Building Ventilation) seems to apply to mechanically ventilated dwellings while section 6.6 is applicable to naturally ventilated spaces as it requires minimum ventilation openings to be met.
Kind Regards,
Aris
Santiago Avila
Junior Sustainability EngineerMay 15, 2024 - 10:02 am
Hello, may I ask how did you solve this problem?