HELL NO. If you are unable to install a traditional metal flue in the way it’s supposed to be installed, if you HAVE to use long horizontal runs or PVC, then you HAVE to install a suitable boiler, not the one you have. You should get rid of this contractor.
Can you vent a furnace with PVC?
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.
Can you use PVC pipe as exhaust pipe?
PVC or ABS plastic piping is often used on high-efficiency heating and water heating systems as vent piping for the exhaust gases, since the exhaust temperatures are relatively low.
What type of vent is required for a high efficiency furnace?
A two pipe venting system should be installed that provides combustion air to the furnace directly from outside. Acidic condensate should be drained or pumped directly into the plumbing system.
Which type of vent pipe is required on a 90% AFUE furnace?
category 4 vent system
Furnaces that are 90 to 98% AFUE are considered very efficient and utilize a category 4 vent system. This means that the flue gases operate under a positive vent stack pressure with a low vent gas temperature, causing the gases to condense before discharging from the vent.
What is code for furnace exhaust?
503.6.
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.
Why do high efficiency furnaces use PVC pipe?
This combination of carbon dioxide and water would damage the type of vents used in conventional systems which run vertically out of a home. To combat this issue, high efficiency condensing furnace uses PVC pipes to extract the acidic water from your home.
What type of pipe is used for gas furnace exhaust?
Gas-powered furnaces produce highly combustible hot gases and byproducts. Therefore, you usually need a metal pipe or chimney to vent them. That being said, some high-efficiency furnaces require PVC pipes rather than metal.
Can I use PVC pipe for HVAC?
PVC and CPVC are low-cost alternatives to metal with properties that are advantageous for use in HVAC, particularly in exhaust systems. PVC is durable and not prone to corrosion or denting, which makes it a good option for ductwork.
Is PVC pipe heat resistant?
Explanation: PVC is a thermoplastic, and therefore, at some point it will begin to degrade and break down as it’s heated up. It just so happens that Schedule 40 PVC’s maximum operating temperature is 140 degrees Fahrenheit, around the same temperature that hot water gets to in most homes.
What type of vent is used with 80 Category I furnaces?
What type of vent is used with 80% Category I furnaces? Type B double wall gas vent.
What is a Category 1 furnace?
Category I Furnaces are the type most commonly used for residential heating. They include old-fashioned gravity vent furnaces and the newer fan-assisted Plus 80 models, also known as induced draft furnaces.
What are the PVC pipes on my 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.
How big does a furnace vent need to be?
Furnace Room Ventilation
Most furnace rooms should have one vent about 12 square inches from the floor and one about 12 square inches from the ceiling, although bigger and more powerful furnaces often require larger vents.
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 do you install a PVC furnace vent?
Quote from Youtube video: So make sure it's level. So for the exhaust. In the screen and a coupler for the intake you have an elbow. And you want the exhaust to stick out six inches past the intake.
Can you put an elbow on a furnace vent 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.
Should furnace vents have screens?
If the vent pipes are not protected by screens, you take a big risk for furnace problems due to pipe obstruction or infestations from pests. A simple screen can prevent pest problems, but the wrong type of screen can create other problems.
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.
Should furnace exhaust be higher than intake?
The exhaust pipe should be pointing up and the intake pointing down. If your intake is above the exhaust terminal, the intake might be sucking up exhaust gases (carbon monoxide, etc.) back into the home!
What happens if there is improper venting of the furnace?
Sometimes improper venting can cause heat exchangers to corrode. Corrosion can also be a result of old age. The big problem is that this corrosion can lead to cracks in your heat exchanger.
