Ventilation for WH utility closet

Originally Posted By: rray
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I know some code guru out there can tell me how much ventilation might be required for a utility closet with a 40,000 BTU water heater.



Home inspections. . . .


One home at a time.


Originally Posted By: bkelly2
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Outside air tight construction. Two verticle ducts 1.sq.in / 4,000 btu, same for 1 attic and 1 crawl space duct. Minimum 3" cross section.


Originally Posted By: hspinnler
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How many gallons is the 40,000 BTU water heater?


Would a 1" gap undeneath a 30" wide solid door leading to an air conditioned kitchen combined with a standard wall mounted return air grille opening into a closed and unconditioned room of approximately 100 sq. ft. work ![icon_question.gif](upload://t2zemjDOQRADd4xSC3xOot86t0m.gif)


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



50 gallons.



Home inspections. . . .


One home at a time.


Originally Posted By: roconnor
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" no matter how large.


For small equipment rooms, this is usually done with two openings (one high and one low) to adjacent space if it's large enough, with the openings 1 sq.in./1,000 Btu and 100 sq.in. minimum each.

Another common option is to have a single opening up high to the exterior at 1 sq.in/3,000 Btu, or two openings to the exterior (one high and one low) at 1 sq.in./4,000 Btu, with a minimum dimension of 3" or sized to match the vent connector whichever is greater.

There are other options for combustion air from ducts, attics, and crawl spaces ... but thats the IRC basics as a guide, and take with one grain of salt since you are in CA which has not adopted the IRC (yet?). CodeCheck has a good summary of the requirements ... CLICK HERE


--
Robert O'Connor, PE
Eagle Engineering ?
Eagle Eye Inspections ?
NACHI Education Committee

I am absolutely amazed sometimes by how much thought goes into doing things wrong

Originally Posted By: wdecker
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More than 2,000 SF.


Had a condo conversion, the other day. They put the furnace and the WH in a small closet. Say the louvered doors and said 'Uh Oh'.

Then saw that they ran a 6" metal vent pipe in from the ceiling and connected to an outside vent. OK.

Then say that the outside vent hood was the type used for a clothes dryer and it had a critter gate and would not allow air to flow in.

O well. Guess its the thought that counts.


--
Will Decker
Decker Home Services
Skokie, IL 60076
wjd@DeckerHomeServices.com