I would be very leary of a hvac contractor would not do this.
Can high efficiency furnace vented through chimney.
High efficiency furnace venting uses two heat exchangers.
Two depending upon where the inlet for furnace combustion air intake pipe is located in relation to the fireplace chimney it could pull fireplace combustion gases and smoke into the furnace.
I believe high efficiency furnances must be vented horizontally through a wall.
Conventional furnaces use only one they use a two stage process.
Condensing gas furnaces achieve their high levels of efficiency by adding another step to the fuel burning and venting process.
As usual new furnaces vent through a pipe that goes from the unit straight out the side of the home.
I think don t it is possible to vent a 95 efficiency furnace up through an existing chimney.
If your furnace has an afue rating of 90 percent or above it will have a flue pipe that goes out of the side of your house.
Traditional gas fired forced air furnaces produce hot combustion exhaust gasses and therefore need metal vent pipes or chimneys.
But it is not advisable.
The heater pipe is normally level and moderately short.
To combat this issue a high efficiency condensing furnace uses pvc pipes to extract the acidic water from your home.
That s because the combustion byproducts are in a gaseous form so the gases can float up through the flue pipe and out of your roof.
That depends on whether you have a standard efficiency or a high efficiency furnace.
In contrast modern high efficiency condensing furnaces exhaust much cooler gasses and need only plastic pipe materials such as pvc cpvc or abs for their exhaust vents.
How new furnaces vent.
In fact we almost always recommend against it if you have an older chimney and a new high efficiency furnace.
Additionally how do you seal furnace exhaust to chimney.
They include a second heat exchanger that reclaims additional heat from the system s exhaust gases before they are vented away.
You need to make sure your furnace is venting properly.
Can your new furnace be vented through the chimney.
These are connected to the furnace and routed out to the side of your home.
You may want to look into simply having the pvc intake and exhaust pipes for the furnace rerouted to go through a sidewall in your basement to the exterior.
Also the acidic elements in the exhaust can damage unprotected chimney bricks and mortar.
If your furnace has an afue rating below 90 percent it will most likely have a flue pipe that goes up through your roof.
I have not heard of high efficieny only lasting 10 13 years.
The venting system is installed at the same time as your high efficiency furnace.
Brush away any dirt or dust from the area around the furnace vent that you will be sealing.
Sometimes we see multiple appliances using the same flue vent system for multiple appliances but this isn t always a possibility.
They are vented outdoors horizontally through a wall by a small plastic pipe.
In standard furnaces all these combustion gases including carbon monoxide are usually vented through chimneys or flues.
The exhaust gas is too cool for it to rise.
