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Old 04-05-2012, 10:18 AM   #1
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air sealing basement


all this talk about are sealing. thats great. but what if the furnace and HWH are in the basement. those need air.
please advise.

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Old 04-05-2012, 10:47 AM   #2
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the furnace has a high and low supply vent from the exterior the water heater does as well i believe.

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Old 04-05-2012, 11:14 AM   #3
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not mine, that i can see. and i do know what i am looking at. both are under 6 years old.
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Old 04-05-2012, 11:47 AM   #4
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Pictures please.

Most do not need anymore air than already leaks into the home.

Many of the newer systems pull combustion air from outside.

If you have the home air sealed and insulated, you need to check drafting and for spillage if you are concerned.
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Old 04-05-2012, 11:50 AM   #5
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pics later. i have to go out now.
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Old 04-05-2012, 05:41 PM   #6
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Did you ask your local AHJ?

Many of the codes vary by location and some change yearly. Example: "The minimum duct cross section dimension is 3”. (M1703.2.1 for oil and G2407.6 for gas)
�� No dampers in combustion air ducts. (M1701.3)
�� Sources of combustion air > 10’ from return air. (M1602)
�� Joist and/or stud space ducting ok only if a maximum of one fire stop is removed. (G2407.11)
�� Openings screened (except in attic) with 1/4” mesh. (M1703.5)
�� Opening sleeved to 6” above ceiling joists and insulation. (M1703.3 & G2407.11)
�� Combustion air obtained from outside of the building when the building is of unusually tight construction.
(M1701.1.1) (Typically homes built after 1986)


1. Minimum of 100 sq.in. per opening of combustion air is required.
2. One opening in upper 12” and one opening in lower 12” of room. (UMC 702.1, see exception)
3. Where vertical ducts are used each opening requires 1square inch per 4,000 Btu/h of total input
rating of all appliances in the space. (M1703.2.1)
4. Where horizontal ducts are used each opening requires 1 square inch per 2,000 Btu/h or total
input rating of all appliances in the space. (M1703.2.1)
5. When the one opening method is used. 12” from top of enclosure 1:3000 Btu/h or total input
rating al all appliances in the space. (G2407.6)"
If under the IRC: http://publicecodes.citation.com/ico..._17_sec001.htm


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Old 04-05-2012, 06:15 PM   #7
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what is an ahj ?

here are the pics. both units are about 7 years old.

i don't plan to heat the basement. except for a wood burning stove for when we are down there watching a movie or whatever. but i would like to air seal it so it acts as a buffer for the heat upstairs.

saying that, there is a space in a wall that goes up to the attic, about 4x12".
perhaps i could put ducts to pull air from the attic ?

excuse the mess. its under construction
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air sealing basement-img_1728.jpg   air sealing basement-img_1729.jpg  
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Old 04-05-2012, 07:42 PM   #8
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Authority Having Jurisdiction.

Where is the wood stove gonna get its air from?

Generally, you seal p he basement. Enclose the water heater and furnace in their own room. And provide outside air for combustion to that room only.
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Old 04-05-2012, 08:30 PM   #9
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Read up on worst case depressurization and spillage.

Many homes that are sealed up quite tightly will still draft and vent quite comfortably.

If you are going to have a wood burning stove, I would suggest a direct vented unit and one that brings in its own combustion air.
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Old 04-06-2012, 08:58 AM   #10
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Quote:
Originally Posted by beenthere View Post


Generally, you seal p he basement. Enclose the water heater and furnace in their own room. And provide outside air for combustion to that room only.
thanx, that is a good idea.

Quote:
Originally Posted by Windows on Wash View Post
Read up on worst case depressurization and spillage.

Many homes that are sealed up quite tightly will still draft and vent quite comfortably.

If you are going to have a wood burning stove, I would suggest a direct vented unit and one that brings in its own combustion air.
thanx. yeah, the stove would have its own in/out air system. and some kind of blower for the heat. i have seen/used 2 different fireplace/stove rooms. and for the small amount of wood they used, they heated the spaces very nicely.

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