This article series describes b vent metal chimneys used for gas fired appliances.
Clear attic furnace flue.
2015 irc m1305 recommends that the furnace have a level working space of at least 30 inches by 30 inches in the front of the appliance.
When you place a furnace in the attic to take advantage of its.
I ve noticed that when i get a light dusting on a snow free roof the first place to melt is the channel between two truces that goes from where my furnace flue exits the roof up to the peak.
If you don t have a crawl space or a basement then it can be a challenge to place a furnace on the ground floor of the structure.
We discuss fire safety fire clearances and other gas appliance venting details for b vent chimneys.
As the title states my furnace flue pipe in the attic is producing moisture which is leaking down into my second floor bathroom ceiling.
Seems our furnace flue as it should comes up through the house through the attic and vents out through the roof.
There are 3 gas furnaces and ac units.
A furnace in the attic is a design that works for all homes.
The stem of the t has soffit vents and no vent at the top.
Where the system is routed to the outdoors through an existing masonry chimney containing flue products from another gas appliance or where required by local codes then 3 venting of type 29 4c stainless steel must be used in place of pvc material.
The furnace is located in the stem.
Masonry flue or shared flue venting.
The furnace btw is natural gas and drives a hot water baseboard heat system.
Heat leak in attic caused by furnace flue pipe i ve been in my home for 5 years and have had consistent ice dam issues in the minnesota winter.
Remove the insulation between the joists where the flue is located to clear an area about 18 inches away from the flue on each side.
Most of the time this gas escapes through the vent pipes but if the pipe and furnace are not properly maintained the gas may not be dispelled.
See also condensing boilers furnaces.
Apply a thick bead of high temperature caulk the flue on one side.
The top of the t has soffit vents and a ridge vent.
Municipalities may require a minimum of 30 clear inches in front of the furnace which can be accomplished in a small room if the door to the room opens in front of the furnace.
The roof is a t shaped gable roof.
You might not receive the same air movement benefits if the unit is in a garage either.
Recently moved into home in eastern ma zone 5 and have a 2 story 3k sqft home.
The issue is the flue itself gets nice and warm which means there is effectively a heater going in the attic when the furnace is active.
It seems like this happens at random but mostly when it is really cold outside like 15 f or colder and it doesn t have to be snowing.
Combustion in gas furnaces produces some carbon monoxide which is a toxic gas.
