Our Office building is ventilated with only 100% Outside Air Systems and thus there is no recirculation.
Table IEQc5-1 of the LEEDOnline form is asking for "isolated exhaust system areas", leading us to that question:
-- Our exhaust air ducts for copy rooms and laundry areas do combine at some point with exhaust air ducts from the office zones into a main single exhaust line directed to the outside.
Would that be considered as a designated/isolated exhaust system?
Thanks for your help!
Dylan Connelly
Mechanical EngineerIntegral Group
LEEDuser Expert
472 thumbs up
April 29, 2013 - 1:23 pm
Charline - great question. We have the same situation on another project.
Yes, for this credit, you can combine the general building exhaust with the copy and laundry room general exhaust when there is no recirculation. Heat recovery from the exhaust will benefit from the extra load (hopefully the project has that as well).
Mara Baum
Partner, Architecture & SustainabilityDIALOG
674 thumbs up
April 29, 2013 - 1:24 pm
If your building is 100% outside air / no recirculation then it's acceptable to combine the exhaust from those rooms with general building exhaust - the intent is to not recirculate contaminated air. If there are highly contaminated exhaust streams (e.g. labs, hospitals) that were required by code to be exhausted separately, then obviously you would still need to do so. Copy rooms and laundry rooms are fine.
Mara Baum
Partner, Architecture & SustainabilityDIALOG
674 thumbs up
April 29, 2013 - 1:25 pm
It looks like Dylan and I responded simultaneously - it's a good thing we were consistent :)
Charline SEYTIER
CEO, Co-owner.ThemaVerde, France
15 thumbs up
April 30, 2013 - 4:14 am
Dylan and Mara, thank you both!
- and yes it is intended for heat recovery, that's perfect!
Charline SEYTIER
CEO, Co-owner.ThemaVerde, France
15 thumbs up
September 4, 2013 - 11:22 am
One additional question: can we combine the exhaust from the janitor closet with mechanical/electrical rooms exhaust?
Off course the AHU is 100% OA /no recirculation.
- the local code does NOT ask them to be exhausted separately.
Dylan Connelly
Mechanical EngineerIntegral Group
LEEDuser Expert
472 thumbs up
September 4, 2013 - 8:29 pm
Charline,
Exhaust from standard mechanical and electrical rooms can be combine with janitor closet exhaust for LEED.
Charline SEYTIER
CEO, Co-owner.ThemaVerde, France
15 thumbs up
September 5, 2013 - 4:15 am
Thank you Dylan!
Charline SEYTIER
CEO, Co-owner.ThemaVerde, France
15 thumbs up
September 6, 2013 - 4:43 am
Dylan,
Sorry, one last thing, could we also combine the Janitor Closet exhaust with the corridor exhaust?
-- The current design uses the same AHU to supply OA to JC, technical rooms and circulation areas to these rooms with combined exhaust for heat recovery.
Thanks for your help!
Dylan Connelly
Mechanical EngineerIntegral Group
LEEDuser Expert
472 thumbs up
September 6, 2013 - 8:02 pm
Yep - that's fine
Tracy Black
Professional Engineering ConsultantEngineered Solutions
September 6, 2013 - 8:55 pm
I agree with Dylan and Mara on this credit. The only item missing from this conversation is the fact that the exhaust from each area must be hydraulically balanced to that one area does not stagnate and the other have too much exhaust. This can be challenging if the duct from the individual areas is of significant length.