Receiving Helpdesk

can you vent a furnace through the wall

by Ms. Kari Glover DVM Published 4 years ago Updated 3 years ago

The short answer is – yes. However, it depends on the type of house and property type. Generally, through-the-wall venting is reserved for high-efficiency furnaces that generate denser exhaust gases.

Both types of heating systems can vent horizontally through a building wall, but the exhaust products of high efficiency or condensing boilers and furnaces are generally cool and have different venting and combustible clearance specifications.

Full Answer

Can a furnace be horizontally vented through sidewalls?

Not familiar with your specific furnace but there were literally thousands of 80% furnaces horizontally vented through sidewalls in the late 80s and 90s. Unfortunately, the grey ultravent pipe used wasn't up to the job and was recalled.

Why do furnaces need to be vented?

These gases would be very dangerous if they got into your home’s air circulation and your family breathed them in, which is why furnaces have venting systems that are used to carry combustion gases out of your home.

Is it worth it to vent a furnace through the chimney?

The fuel savings over the yrs and rebates and lack of expense to repair the chimney will make it worthwhile. Not familiar with your specific furnace but there were literally thousands of 80% furnaces horizontally vented through sidewalls in the late 80s and 90s.

Can I add a power vented fan to my furnace?

You have an induced draft fan with a pressure switch and adding another power vented fan will cause pressure switch problems and won't meet the gas code. How old is the furnace, post make model and serial #.

Can you vent furnace out wall?

Direct Vents These furnace vents can be installed horizontally through an exterior wall, or vertically so exhaust fumes go out through the roof. Although more costly than a natural vent, a direct vent is also a more efficient and safer option.

How do you install a furnace vent through the wall?

1:445:43Installing a Heat Shield between single wall vent pipe - YouTubeYouTubeStart of suggested clipEnd of suggested clipAnd these nuts are actually a spacer that keeps it away from the wall. You could also use doubleMoreAnd these nuts are actually a spacer that keeps it away from the wall. You could also use double sided tape or super glue to glue those nuts on there.

How do you vent a high efficiency furnace through a wall?

Proper sidewall venting requires installing separate vent pipes horizontally so that they vent to the outdoors through a wall of your home. These ventilation pipes should be isolated from the furnace combustion chamber and made airtight to eliminate the possibility of combustion gas leakage.18-Mar-2019

Can a high efficiency furnace be vented vertically?

Sidewall Venting (High efficiency appliances) Venting can also be vertically vented through the roof (be wary as there can be unforeseen problems with venting through the roof as they are not easily maintained). Separate venting pipes are an optimal choice here as well.

Can you vent a 80% furnace through a wall?

An 80% efficient furnace CAN be side wall vented per National Fuel as Code 7.3. 4 with the use of a “mechanical draft system of either forced or induced draft design”. ... You CANNOT just take the vent off an 80% efficient furnace and run it out a side wall. You need to use an auxiliary power inducer.20-Apr-2012

Can PVC be used to vent a furnace?

Traditional gas-fired, forced-air furnaces produce hot combustion exhaust gasses and therefore need metal vent pipes, or chimneys. 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.21-Oct-2019

Why is there a vent on the side of my furnace?

High-efficiency furnaces use sidewall vents for “breathing” in outside air for fuel combustion, and “exhaling” cooled exhaust gases nearly depleted of heat.27-May-2020

What happens if there is improper venting of the furnace?

Combustion byproducts, such as carbon monoxide, can lead to many ill effects. This includes headaches, dizziness, nausea, fatigue, and even death. When your furnace has a blockage or backdraft and cannot properly vent, combustion gases cannot escape.07-Mar-2016

Does furnace vent need to be sloped?

The vent pipe must have a minimum 1/4 inch per foot of slope towards the furnace. There cannot be any sags between hangers. For a 20 foot run you would need at least of 5 inches of slope.

Why do high efficiency furnaces use PVC pipe?

To combat this issue, high efficiency condensing furnace uses PVC pipes to extract the acidic water from your home. These are connected to the furnace and routed out to the side of your home. The venting system is installed at the same time as your high-efficiency furnace.20-Nov-2017

Where do you vent a furnace?

The gas vent (chimney for the furnace) should extend at least 3 feet above the highest point where it passes through a roof and at least 2 feet higher than any portion of the house within a horizontal distance of 10 feet.

How far can you vent a furnace?

The maximum vertical distance you can run a furnace exhaust vent is about 15 feet. If there is a forced air inlet within 10 feet of the exhaust vent, the exhaust gas ventilation terminal should be positioned at least 3 feet above it.

What does AFUE mean on a furnace?

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. That’s because the combustion byproducts are in a liquid form, so they need to be drained out of your home in a similar way that the condensation from your air conditioner is drained outside.

Why use a heat exchanger in a gas furnace?

This heat exchanger extracts extra heat from the combustion gases that would otherwise be wasted. This allows your furnace to get more heat out of the gas that it consumes.

Why do furnaces have vents?

When your furnace burns fuel, it produces combustion gases as a byproduct. These gases would be very dangerous if they got into your home’s air circulation and your family breathed them in, which is why furnaces have venting systems that are used to carry combustion gases out of your home.

What is high efficiency furnace?

High efficiency furnaces produce different combustion gases than standard efficiency furnaces. With standard-efficiency furnaces, the byproducts of the combustion process contain a certain amount of heat and are released from the furnace in a gaseous form. High efficiency gas furnaces take advantage of the fact that combustion gases contain heat, ...

Does a furnace have a flue?

That depends on whether you have a standard efficiency or a high efficiency furnace. If your furnace has an AFUE rating below 90 percent, it will most likely have a flue pipe that goes up through your roof. 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. ...

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