High Efficiency Furnace Venting Freezing At Roof Vent

That depends on whether you have a standard efficiency or a high efficiency furnace.

High efficiency furnace venting freezing at roof vent.

Once a high efficiency condensing furnace removes this excess heat that conventional furnaces vent to the outside of a home the leftover mixture is acidic water. This high efficiency venting system must be installed when you install the new furnace. There is a disconnection at the elbow. The gas vent pipe from the water heater tank is improperly sloped.

These pvc pipes are connected to the furnace and expelled outside. Many municipalities do not allow metal foil tape either. Abs acrylonitrile butadiene styrene if you must know is the cheapest solution but it is often too flexible and susceptible to joint leaks and even cracks due to expansion contraction softening of the material with temperature difference. This vent pipe is connected to the shared vent stack with the furnace.

Due to high efficiency furnaceshaving their own fresh air intake no air is drawn from inside your home. 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. Cloth duct tape is not permitted to be installed on fuel burning appliance vent pipes. If your furnace has an afue rating below 90 percent it will most likely have a flue pipe that goes up through your roof.

Insulating pipe is important to avoid condensate icing. Vent freezing protection when the vent pipe is exposed to temperatures below freezing i e when it passes through unheated spaces chimneys etc the pipe must be insulated with 1 2 inch thick sponge rubber insulation armafl ex type insulation or equivalent. There exist many but mainly three types of plastic are commonly used for high efficiency appliance venting. This combination of carbon dioxide and water would damage the type of vents used in conventional systems which run vertically out of a home.