All gas furnaces must be vented, to allow exhaust gases from the combustion process to escape. … Even furnaces vented through walls are routed through vertical pipes that extend above the roof. Most furnaces are vented directly through roofs, with either a single pipe or a two-pipe system.
Can I vent my furnace out the side of my house?
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.
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.
Can a high efficiency furnace be vented vertically?
A conventional natural gas furnace will vent the dangerous combustion gases through a simple vertical exhaust system that is attached to the furnace. … To avoid this problem, high efficiency furnace venting requires the use of PVC pipes instead of metal pipes to remove the acidic condensate from your home.
Can B Vent be used horizontally?
No. Per the sizing tables, all orientations must terminate vertically with a UL listed rain cap, otherwise the appliance may not vent properly. Per the sizing tables, all orientations must terminate vertically with a UL listed rain cap, otherwise the appliance may not vent properly. …
Can you direct vent an 80% furnace?
The answer is YES and NO! 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.
Can you vent a 80% furnace through a wall?
The answer is YES and NO! 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.
How do you vent a furnace through a wall?
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. The combustion air flow through the furnace must be controlled or its efficiency will decline.
Can PVC be used to vent a furnace?
Ironically, even though the presence of plastic vent pipes has become synonymous with high-efficiency condensing furnaces, PVC pipe manufacturers do not recommend PVC for this application. Nor are there any official ASTM standards for plastic pipe used as combustion gas venting.
Do I need a fresh air intake on my furnace?
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. … No matter what kind of furnace you have installed, the system will push air out of your home.
What type of venting is used on a high efficiency furnace?
Sidewall Venting (High efficiency appliances)
This type of venting uses a 1 or 2 pipe system. An intake and an exhaust pipe are run separately and can be placed through almost any exterior wall, so they provide greater placement flexibility for a new furnace.
Where do you vent a high efficiency furnace?
Because high-efficiency furnaces use sidewall vents, they’re more susceptible to airflow blockages. The area around the sidewall vents should be clear of all airflow blockages for a minimum two feet in all directions. When air intake is blocked or hindered, fuel combustion suffers, and the furnace locks out.
Why do gas furnace efficiencies jump from 80 to 90?
Why do gas furnace efficiencies jump from 80% to 90%? Efficiencies over 80% cause condensation but the flue gas is still too hot for PVC vent pipe until the efficiency reaches 90%.
Why can’t b vent be used horizontally?
No, a B vent pipe cannot be terminated horizontally. According to manufacturers, all B vent pipes must terminate vertically with a rain cap in place in order to vent properly.
Can I vent my gas furnace horizontally?
Exhaust fumes are vented through the smaller, inner pipe. 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 I vent my water heater horizontally?
Since the vent does not rely on the buoyancy of hot air, it can be run horizontally to the outside of the house. The blower cools the air so the vent can be run in PVC pipe (rather than metal, as is required with atmospheric venting) and is easy to assemble.