Furnace Vent Into Chimney

If your furnace vents into a chimney a combustion safety test is the only way to be absolutely sure that combustion gases aren t backdrafting into your home.

Furnace vent into chimney.

Thirty years ago it was common practice to vent gas furnaces and water heaters into tile lined masonry chimneys. Through these gaps if left unsealed combustion gases may leak into your home and build up to unhealthy levels. Brush away any dirt or dust from the area around the furnace vent that you will be sealing. If you have an older furnace it likely vents into a chimney with rigid metal duct.

Refer to figure 2. 2 currently venting gas appliances to a tile lined masonry chimney is allowed if all these conditions as regards the. Appliances manufactured around this time were about sixty percent efficient fuel used versus heat generated for the structure. Consequences of improperly assembled vent pipes problematic chimney flue deteriorating chimney walls can be sometimes fatal fire and carbon monoxide poisoning are topping the list.

And while you should definitely have a carbon monoxide detector in your home waiting for it to go off is not a good strategy especially since it might not even go off when you need it to. 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. The connections on the flue slip into each other secured with screws.

The basement ceiling is about 6 1 2 or 7 feet high. These appliances used draft hoods also known as draft diverters in their venting systems. Also known as the type b this vent is operating on the natural air convection. It could either go out the unused walled in chimney that the oil furnace was vented through or they could cut a hole in the concrete block wall and vent it out the side of the house.

Look closely at these connections and you will likely see gaps. The conditions explained in this post also apply to the wood burning appliances. Inject the silicone caulk into the gap between the vent and the side of the house or foundation. When the vent is withdrawing air from the house it expels the gas outside through the vent.

Cut the tip of a caulk tube with a utility knife. When venting two appliances separately into a common chimney always install the smaller flue pipe appliance with lowest gph input at a higher point into the chimney than the larger flue pipe for the appliance with the largest gph input. Proper furnace water heater venting is an extremely important issue which depends on the performance of the house chimney chimney flue or other exhaust assemblies. Furnace vents into chimney 1 currently venting gas appliances to an unlined masonry chimney is prohibited.