I have a gas water heater located in a utility/laundry room in the house. In
addition to the normal vent pipe coming out of the top of the water heater,
there are two 6" diameter vent pipes coming from the attic into the utility
room adjacent to the water heater. One pipe comes down 24" from the ceiling
and the other pipe is 71. I've never seen anything like this, but I'm
assuming it provides some type of venting.
Is this arrangement necessary? If it is necessary is there some other way
that I can vent the area? The room is fairly small and I need a couple of
inches to fit our washer and dryer in the utility room.
You would really like mine. You need a source of air near
the top (think mine says within 18" of the ceiling) and a
source near the floor. Well, the clods that installed mine
cut a hole in the floor to the crawl space without much
thinking about floor integrity and put a grate over it and
then cut a hole in the ceiling to the attic and put a grate
there. They just pushed the attic insulation back, but the
inspector made them install a metal collar to hold the
I didn't like air from the crawlspace getting into the house
(the water heater space is in a little cove with the washing
machine but open to the rest of house). And I didn't like
hot air going from the house into the attic. So I looked in
the book that came with the water heater to find out the
options and the size of openings that I needed. Then I put
two aluminum tubes down from the ceiling hole (maximum 18
inches from the ceiling (to reduce hot air flowing out) and
18 inches from the floor to replace the floor opening. In
fact, I did not close the floor opening and it is not
necessary but decided to leave it and to put a high quality
filter in the cutout. I now plan on enclosing the space
with a quick remove pannel
As to your questions, there are various options for getting
air depending on if you take air from the outside, or the
rest of the house. See if you can read a book that goes
with a gas water heater (one of the BORGs or an appliance
seller might let you read one) to find out the opening sizes
you need. You probably need to leave teh short tube, but
you may be able to change or get rid of the long tube
depending on your floor plan.
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