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!

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Dylan Connelly

Mechanical Engineer

Integral Group

LEEDuser Expert

342 thumbs up

Mon, 04/29/2013 - 17:23

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 & Sustainability

DIALOG

LEEDuser Premium Member

449 thumbs up

Mon, 04/29/2013 - 17:24

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 & Sustainability

DIALOG

LEEDuser Premium Member

449 thumbs up

Mon, 04/29/2013 - 17:25

It looks like Dylan and I responded simultaneously - it's a good thing we were consistent :)

Charline SEYTIER

CEO, Co-owner.

ThemaVerde, France

LEEDuser Basic Member

15 thumbs up

Tue, 04/30/2013 - 08:14

Dylan and Mara, thank you both! - and yes it is intended for heat recovery, that's perfect!

Charline SEYTIER

CEO, Co-owner.

ThemaVerde, France

LEEDuser Basic Member

15 thumbs up

Wed, 09/04/2013 - 15:22

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 Engineer

Integral Group

LEEDuser Expert

342 thumbs up

Thu, 09/05/2013 - 00:29

Charline, Exhaust from standard mechanical and electrical rooms can be combine with janitor closet exhaust for LEED.

Charline SEYTIER

CEO, Co-owner.

ThemaVerde, France

LEEDuser Basic Member

15 thumbs up

Thu, 09/05/2013 - 08:15

Thank you Dylan!

Charline SEYTIER

CEO, Co-owner.

ThemaVerde, France

LEEDuser Basic Member

15 thumbs up

Fri, 09/06/2013 - 08:43

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 Engineer

Integral Group

LEEDuser Expert

342 thumbs up

Sat, 09/07/2013 - 00:02

Yep - that's fine

Tracy Black

Professional Engineering Consultant

Engineered Solutions

LEEDuser Basic Member

0 thumbs up

Sat, 09/07/2013 - 00:55

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.

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