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Combustible Air vent for water heater installation

0 votes
The vents that I'm referring to are not attached to the water heater. The plumber says I have to have additonal venting in my tiny laundry room.

He's says it appears the vents were once there. There are two holes in the ceiling attached to nothing. They look like a figure 8 and appear to have once housed two 6in vent pipes. The opening is 12in across the figure 8 holes.

I'm trying to figure out if I can just stick two 6 in pipes in their. I called a heating and cooling guy who told me he would charge me $150 to do it but he said I could easily do it myself.
asked in Gas Water Heater by teliesaa (120 points)
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1 Answer

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Hi Teliesaa,
You left some important information out of your question so I don’t have enough to give you a conclusive answer. You can start from checking a couple of my articles concerning combustion air supply for fuel burning appliances:
The amount of combustion air required for any fuel burning appliances depends on the BTU’s of the appliance (those should be listed on the label attached to your WH). The size of the openings providing combustion air depends on where that air is coming from (exterior, attic, crawlspace, another room, etc.). Since you didn’t provide any of that information I can’t really tell you if 2 x 6” diameter pipes will be sufficient.
House interior scenarios and corresponding vent sizes are explained inside the articles linked above (don’t worry about “Chicago condo…” title in the second article, it applies everywhere).
Since there are a few possible scenarios just click the “comment” button below this answer and; provide BTU’s of your WH along with a detailed description of its location (closet), what’s above, below and behind the walls, what area does this laundry room opens to?
Thanks, Darek
answered by darekrudy (21,730 points)