What are the two pipes on a high efficiency furnace?

High-efficiency furnaces come with two pipes; one pipe brings combustion air directly into the furnace and mixes it with fuel. The other pipe exhausts the combustion gases directly to the outdoors.

Do high efficiency furnaces need fresh air intake?

Since high efficiency furnaces draw air directly from outside, the furnace itself does not require a fresh air intake in order to replace inside air that otherwise would have been drawn from the room the furnace is located in.

What are the 2 PVC pipes on my furnace?

Direct-vent (two-pipe) system: The two-pipe system is most common in home heating applications. It provides a direct intake vent that brings outside air to the sealed combustion chamber with one pipe, while a second vent pipe provides sealed venting of exhaust gases back to the outside of your house.

Why does my furnace have 2 vents?

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

What are the white pipes on furnace?

-A white PVC vent pipe coming out of the side or top of your furnace means that you have a high-efficiency condensing furnace. -If you just see a metal vent pipe, then you have a conventional furnace.

Does my furnace have fresh air intake?

Fresh Air Intake: If there’s a screen, it’s an intake. This is where the cool fresh air makes it’s way back to your HVAC equipment. You can test this by turning on the furnace and feeling the suction as it draws air in. Exhausts: If the vent has a flap, it’s an exhaust.

Does a furnace need a cold air return?

No furnace can adequately operate without sufficient return air supply. We can think of a furnace as lungs. It ‘breaths out’ hot and it ‘inhales’ cold air. Air return vents are necessary for the ‘inhale’ process.

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.

What is the white pipe coming out of my furnace?

What are the pipes that come out of a furnace?

If your furnace is 90% efficient or greater, you probably have PVC pipes coming out of the wall of your home that look something like those pictured here. These pipes allow the furnace to intake fresh air and to safely vent flue gasses out of the home.

Can I use flexible duct for cold air return?

Flex duct is widely used for return air in commercial air conditioning systems. Flex duct is able to withstand a certain negative pressure of return air. When installed properly, a flex duct is a reliable and convenient ductwork solution.