Fresh Air
I have a boiler room with a small gas fired hot water system. I’m going to need to installed 2 more of the same. Does the need to increase the fresh air duct likewise increase? The venting of the exhaust will require individual vents, that should not be a problem.
I have a boiler room with a small gas fired hot water system. I’m going to need to installed 2 more of the same. Does the need to increase the fresh air duct likewise increase? The venting of the exhaust will require individual vents, that should not be a problem.
Right. Actually, the sealed combustion boiler requires no room-air intake.
I just had a boiler inspector insist I add a second 12″ x 12″ air intake “communicating directly to outside air” with a fire damper, because I have a boiler and 100-gallon commercial water heater in the room. Often, these “requirements” are at the discretion of the inspector.
Thanks MP for looking out for me. The current boiler is a natural draft. and yes the sealed unit is apples to oranges. My concern was if I had to multiply the 144 by 3. Maybe a combination of the 2 different types might work in that the sealed one I believe requires less volume fresh air intake?
Modsquad,
Jockdeboeraia is describing a forced-draft, sealed-combustion boiler.
Brooklynexpediter is quoting the code as it concerns natural draft boilers.
You’ve gotta know what you’ve got there first, bro.
thanks to both of you. I needed that info post-haste.
Fresh air duct must be in the room having a minimum of 144 sq. inches. The rest is up to the manufacturer specifications so you will have to llok on that rather. As far as building code you should be ok if it was sized sufficiently to begin with.
it depends upon the one you buy. some require direct ducts for both intake and exhaust, others take the air from the floor. depends upon the size…