Venting furnace/hot water heater room
#1
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Venting furnace/hot water heater room
In a small room, about 5' by 5' there is a gas furnace and a gas hot water heater. There is no vent in the door, or in any wall. In reading info on the web I see that this is a major safety problem and need to install vents. I see that there should be two vents, one near the floor and one within 12 inches of the ceiling, the size based on the BTU formula of 1 sq inch per 3000 BTUs of fuel input. My question is can the upper vent be in the ceiling to a vented attic?
Thanks.
Thanks.
#2
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That is how our utility room is setup. They actually have 2 - 6 inch vents to the attic, one cutoff within 6 inches of the ceiling the other within 6 inches of the floor.
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installing two grilles opening the utility room into the rest of the house will need to be done for combustion air. typically 2 grilles 12x12 or 10x10 is all that is needed. one about 6-12 inches above floor and one 12 inches from ceiling. i would also advise running a fresh air make up if possible, which would consist of a 8 inch round flex ducting connected to the return ductwork on the furnace from outside. just be sure it is before the filter and that there is a screen on the vent outside. this will help to balance the pressures in the house. also cut in a supply register on the supply duct of the furnace in the utility room to pressurize the room and reduce chances of downdraft of furnace and waterheater flue.
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The vents are nothing more than 6 inch round ducts that lead to the attic. Look at the Galvanized pipe on tinworks.com mine look just like that except I think they may be steel.
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im lost on what vents your talking about aasu. if you mean the flue piping then that is a double walled bvent pipe that protrudes through the attic and out the roof unless a chimney is being used.
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nomore9to5: The flue pipes for the furnace and the water heater bot vent out thru the roof. My apoligies I just assumed tinworks.com was a small single walled pipe loose inside a larger single walled pipe. I figured they were just showing a couple differents sizes for the picture.
Let's see if the ascii art comes out ok. If this picture makes it thru it will explain alot better.
___________________
4 | |
__| | Here is my room
(1) | 1. pipe cut only 6" below ceiling
| 2. pipe cut only 6" above floor
(2) | 3. Gas furnace
_____ | 4 Gas Water Heater
3 | |
_____|_____________|
Remember both 1,2 are vented to the attic about 5 ft from open gable end. Probably not the best setup but it what the last home owner left.
Let's see if the ascii art comes out ok. If this picture makes it thru it will explain alot better.
___________________
4 | |
__| | Here is my room
(1) | 1. pipe cut only 6" below ceiling
| 2. pipe cut only 6" above floor
(2) | 3. Gas furnace
_____ | 4 Gas Water Heater
3 | |
_____|_____________|
Remember both 1,2 are vented to the attic about 5 ft from open gable end. Probably not the best setup but it what the last home owner left.