A gas water heater should have a vent that goes through the roof for exhaust gases. I think air requirements for the burner are pretty small and easily supported without having vents in the wall. Think about a gas range in the kitchen. There are no vents required for air supply.
I am still scratching my head why these vents would be in a garage.
Bob
From: DoIt_Yourself@yahoogroups.com [mailto:DoIt_Yourself@yahoogroups.com] On Behalf Of mariannelee3
Sent: Saturday, November 17, 2012 12:53 PM
To: DoIt_Yourself@yahoogroups.com
Subject: [DIY] Re: Insulate garage door
I live in California. Both my house, which was built in 2003, and my parents house, which was built in 1962, have vents along the base of one exterior wall. I wonder if this is because the water heaters are housed there?
Marianne
--- In DoIt_Yourself@yahoogroups.com, "LarenCorie" <larencorie@...> wrote:
>
> Posted by: "bob@..."
>
> >- None of my garages ever had a wall vent.
>
> Posted by: "wired" wiredformen@...
>
> > Here in Texas I have not seen these vents either.
>
> Greetings;
>
> I have been a home designer for most of my life, and
> I have never heard of such venting, as standard practice.
> I would assume that it would be there mainly for reducing
> interior humidity and condensation, rather than for venting
> exhaust fumes. But, some garages, just as many barns
> do, have vented cupolas up on their roofs. Most older
> garages have been built without a poly vapor barrier under
> the slab, so moisture rises through them, from the ground,
> and of course, cars can carry in snow and other forms of
> moisture. However, a slab, over dry ground (or gravel fill)
> with poly VB should not require the garage to be vented,
> any more than natural leaks, and occasional door opening.
>
> -Laren Corie-
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