Gas B-vent terminates near (bedroom) windows.

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#1

Originally Posted By: jgallant
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Is there a standard minimum distance and height combination that a gas appliance “B” vent needs to be from an openable window to prevent exhaust gasses from entering living spaces? A house I inspected today, built in 1993, had a “B” vent terminate level with the bottom edge of upstairs windows, 5 feet from an openable hallway window and 6 feet from an openable bedroom window. Seems like an obvious risk of CO poisoning to me.


![](upload://39I4VPV40KC0qXJ8rPDfv0ICJYj.jpeg)

--
-Jim Gallant
Owner, All Point Home Inspections - Poulsbo, WA www.allpointinspections.com
Co-founder, ReportHost (Web-based report writing service) www.reporthost.com

#2

Originally Posted By: dvalley
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Jim,


This B-vent should be 8 feet away from any vertical wall and two feet above. B-vents should never terminate near window openings.

This vent is in violation of the 3-2-10 rule anyways. ![](upload://dT7PXS8lZhpuVS6c8qAaMebqRVH.gif)It's too short.

--
David Valley
MAB Member

Massachusetts Certified Home Inspections
http://www.masscertified.com

"Some cause happiness wherever they go; others, whenever they go."

#3

Originally Posted By: jgallant
This post was automatically imported from our archived forum.


dvalley wrote:
Jim,

This B-vent should be 8 feet away from any vertical wall and two feet above. B-vents should never terminate near window openings.

This vent is in violation of the 3-2-10 rule anyways. ![](upload://dT7PXS8lZhpuVS6c8qAaMebqRVH.gif)It's too short.


--
-Jim Gallant
Owner, All Point Home Inspections - Poulsbo, WA www.allpointinspections.com
Co-founder, ReportHost (Web-based report writing service) www.reporthost.com
#4

Originally Posted By: jpeck
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David,


The 3-2-10 rule does not apply to B vents with B vent caps. With unapproved caps or vents, yes, 10 feet applies.

8 feet from the wall or 2 feet higher than it for listed B vent sizes 12" and smaller.

Don't know of anything addressing windows, maybe because it is already required to be 8 feet from any wall ...

--
Jerry Peck
South Florida

#5

Originally Posted By: jgallant
This post was automatically imported from our archived forum.


Where does the “8’ away” or “2’ above” rule come from? In case someone calls me on this. NFPA? IRBC?

–
-Jim Gallant


Owner, All Point Home Inspections - Poulsbo, WA www.allpointinspections.com


Co-founder, ReportHost (Web-based report writing service) www.reporthost.com

#6

Originally Posted By: tallen
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Jim,



It is IRC [2426.6.5] and UMC {806.4}

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I have put the past behind me,
where , however, it now sits, making rude remarks.

www.whiteglovehomeinspections.net

30 Oct 2003-- 29 Nov2005

#7

Originally Posted By: jpeck
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Also comes from the manufacturers installation instructions.

–
Jerry Peck


South Florida