Should furnace exhaust point up or down?

The combustion air, which brings air into the furnace should point down and the exhaust should snorkel up and then elbow out. Keeping in mind the combustion pipe and exhaust pipe should be 12” vertically apart and they should be above anticipated snow levels.

Can a gas furnace be vented horizontally?

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.

Can you put an elbow on a furnace exhaust pipe?

Bend It. A direct vent stove can have an elbow in the vent, and those vented through a wall instead of the roof often do. This is because it is recommended that the pipe run vertically for a certain distance before reaching the outside. In these cases the elbow may be either inside or inside the wall.

How do you route a furnace exhaust?

Quote from the video:
Quote from Youtube video: The Installer must route the flue. And the combustion air pipes in the most direct route as possible also be sure that you use the minimum amount of elbows 45s. And other fittings.

Can high efficiency furnaces be vented vertically?

This system requires PVC piping for the air intake and the exhaust vents to be routed through the sidewall. Vertical venting that pre-exists is unsuitable for the exhaust this system does create.

What is code for furnace exhaust?


A Type B or L gas vent shall terminate not less than 5 feet (1524 mm) in vertical height above the highest connected appliance draft hood or flue collar. A Type B-W gas vent shall terminate not less than 12 feet (3658 mm) in vertical height above the bottom of the wall furnace.

Can a gas furnace be vented out the side of the house?

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”.

Can B Vent be used horizontally?

The Type B or single-wall vent connector cannot be installed horizontally. But it can be run almost horizontally: 1/4” per foot slope upward toward the vent, with no dips or sags, per International Residential Code (IRC G2427. 10.7). The vent it connects to must terminate vertically.

Can you vent an 80 furnace horizontally?

Yes, you can vent an 80% furnace horizontally but it needs a “B-vent” external blower and the proper galvanized metal flue pipe (forget the name right now).

Does furnace vent need to be sloped?

A vent connector shall be installed without dips or sags and shall slope upward toward the vent or chimney at least 1/4-inch per foot (21 mm/m),” according to the Florida Building Code Residential Edition (FBC) and the International Residential Code (IRC) at G2427.

How long can a furnace exhaust pipe be?

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.

How far should furnace exhaust be from intake?

Wall intakes must be located at least 10 feet from any appliance vent or any vent opening from a plumbing drainage system. Wall intakes must also be 10 feet from any exhaust fan discharge outlet unless that outlet is 3 feet or more above the intake location.

How should a high efficiency furnace be vented?

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.

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.

Can you exhaust a high efficiency furnace through the chimney?

These high efficiency units use PVC pipe to pull air in for combustion and vent the by-products to the outdoors. Your furnace won’t exhaust gases into your chimney anymore. Instead, an HVAC contractor will install the system to expel the exhaust directly outside your home.

Should furnace exhaust pipe be covered?

Covering your furnace exhaust pipe can be a crucial step in preventing venting issues during the winter season.

Where are furnace exhaust pipes located?

Finding your intake and exhaust pipes

They are most likely located through a wall near the furnace. Then, go outside and look for the furnace intake and exhaust pipes, based on where they exited the building when you looked at the furnace.

How do I hide my furnace exhaust pipes?

A larger planting bed with small shrubs will hide the vents and meter from the Curb Appeal view. If you are wanting to hide them even more for your own serenity, consider installing a short solid wood screen much closer to the vent, meter and white PVC pipe. Build it and paint it to mimic the Tudor style of the house.

How do I stop my furnace exhaust from icing up?

To prevent this, your furnace installer should ensure that intake and exhaust vent pipes are properly sloped with grade back toward the furnace, supported, and installed with as short a distance between your furnace and the intake/ exhaust termination as possible with the fewest number of elbows.