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  #1  
Old 11/29/12, 10:39 PM
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jnadeau jnadeau is offline
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Default Vent from garage to laundry room

I found two vents going from the attached garage to the laundry room(air conditioned space). It appeared that someone cut 10 or 12 inch square holes and screwed a few vent covers on them. The holes were next to the walk thru door and one was near the ceiling and the other near the floor lined up in the same vertical plane. I recall something about not having a vent from the garage to living space.

Of course the Realtor thought it was required because the water heater is gas operated and needed a vent. He did mention that the laundry hook ups were available for a gas dryer.

Is this a problem?

Thanks

Ps I wasnt there for a inspection at the time.
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  #2  
Old 11/30/12, 1:49 AM
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Bob Elliott Bob Elliott is online now
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Default Re: Vent from garage to laundry room

Garage has exhaust fumes and air is being pulled in to the living space?
Yes that is a very big problem.

Air conditioned means returns.
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  #3  
Old 11/30/12, 6:49 AM
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Default Re: Vent from garage to laundry room

Without further information or photos, I would agree with Bob. This would be even a bigger problem if the building is opertaing in negitive pressure.



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  #4  
Old 11/30/12, 7:11 AM
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Default Re: Vent from garage to laundry room

What do you mean by negative pressure?

Thanks for the replies.
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  #5  
Old 11/30/12, 7:59 AM
Clint VanNest Clint VanNest is offline
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Default Re: Vent from garage to laundry room

There would also be an issue with the break in the firewall.




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  #6  
Old 11/30/12, 8:07 AM
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Fred Sylvester Fred Sylvester is offline
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Default Re: Vent from garage to laundry room

What do you mean by negative pressure?


http://www.buildingscience.com/docum...ding-envelopes



PO BOX 61664
Fort Myers, FL. 33906
239-936-7579
HI-278~~~~~CB-C025051
Building Inspections since 1993
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  #7  
Old 11/30/12, 8:10 AM
Scott P. Surridge Scott P. Surridge is offline
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Default Re: Vent from garage to laundry room

There needs to be make up air for the gas water heater at the interior heated space. This is done with a grill in the ceiling and a lower air chase with the grill about 12" off the floor. What is there is a breech of the firewall and is not considered make up air.
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  #8  
Old 11/30/12, 8:24 AM
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Barry Adair Barry Adair is offline
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Default Re: Vent from garage to laundry room

Quote:
Originally Posted by jnadeau View Post
What do you mean by negative pressure?

Thanks for the replies.
take a straw
suck = negative pressure
blow = positive pressure

unassisted, direct draft combustion appliances suck their combustion and draft air, thus negative pressure has to be pulled into the unit for proper function
ask yourself where does this air come from and what replenishes it for proper continued operation?
it can not convey directly from the garage air to the living space

living space and garage fire separation change in the irc
http://media.iccsafe.org/news/eNews/...0/IRC302.6.pdf



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Last edited by badair; 11/30/12 at 8:29 AM..
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  #9  
Old 11/30/12, 8:30 AM
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Fred Sylvester Fred Sylvester is offline
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Default Re: Vent from garage to laundry room

Quote:
Originally Posted by jnadeau View Post
What do you mean by negative pressure?

Thanks for the replies.
Here is another web page that is not so technical as Joe's

http://www.ecoevaluator.com/building...-boundary.html



PO BOX 61664
Fort Myers, FL. 33906
239-936-7579
HI-278~~~~~CB-C025051
Building Inspections since 1993
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  #10  
Old 12/1/12, 9:17 AM
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jnadeau jnadeau is offline
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Default Re: Vent from garage to laundry room

Great info

The Gas fired water heater is actually in the garage. Now I didnt look for any dedicated vents inside the garage, should there be?
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  #11  
Old 12/2/12, 9:35 PM
William H. Smith William H. Smith is offline
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Default Re: Vent from garage to laundry room

Quote:
Originally Posted by jnadeau View Post
Great info

The Gas fired water heater is actually in the garage. Now I didnt look for any dedicated vents inside the garage, should there be?
There needs to be a make up air from the outside for the gas equipment in the garage. Vents into the residence is WRONG and need to go. If there is gas equipment in laundry room with a door it also needs to have combustion and make up air vents (withing 12" of floor/ceiling) to an exterior room with acess to the exterior or vented to the exterior directly
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