Chimneys are usually vertical or as near as possible to vertical to ensure that the gases flow smoothly drawing air into the combustion in what is known as the stack or.
Gas furnace venting into chimney.
The manufacturer s listing and instructions will preclude attaching any other appliances to it.
However using an interior chimney is extremely limited.
Gas and oil appliance venting.
But many don t realize that a gas heating appliance whether it is a furnace boiler or even a water heater relies on the chimney for proper venting of the exhaust.
They can t all rise to the top of the chimney so some of them backdraft through the vent pipe itself and enter the home s crawlspace.
To ensure proper venting however a liner must first be installed in the chimney.
For instance a 100 000 btu furnace venting into an interior chimney with a 38 square inch liner would not be allowed regardless of chimney height.
Furnaces that vent into chimneys can be hazardous but they don t have to be.
I ran across a permitted 2003 installation today of an 80 furance water heater venting into a clay lined masonry chimney.
The rules apply to listed appliances.
For gas venting appliances the chimney flue venting rules are more complex simply because of the variety of products on the market.
A gas stove can be vented through an existing chimney whether it is a manufactured or masonry chimney.
Gas fireplaces are factory built systems.
When the furnace exhausts into the chimney the gases quickly cool off before exiting to the outdoors.
I ve never seen one that recent not being lined up to the top so it got me thinking.
The height of the chimney the area of the liner and the input of the appliance all play a role in the use of the chimney.
Appliances fueled by natural gas or propane may not produce the visible soot that appliances burning other fuels do but they can deposit corrosive substances in your chimney.
A conventional natural gas furnace will vent the dangerous combustion gases through a simple vertical exhaust system that is attached to the furnace.
The exhaust system typically uses metal venting often routed into a chimney stack to exhaust the combustion gases created in the furnace fire chamber.
When we are talking about gas furnace vent pipe code we need to talk about the different types of the vents first after all you want to keep your family safe from harm.
A chimney is an architectural ventilation structure made of masonry clay or metal that isolates hot toxic exhaust gases or smoke produced by a boiler stove furnace incinerator or fireplace from human living areas.
This chimney rule can be applied to wood burning fireplaces heating stoves and any oil fueled appliances but remember that manufacturer requirements have to be incorporated into it.
Multiple gas or oil furnaces or boilers as well as hot water heaters can be vented into one flue.
Well making sure that you choose the right venting style will protect them.
