High Efficiency Furnace Venting Freezing At Roof Vent

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.

High efficiency furnace venting freezing at roof vent. 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. There exist many but mainly three types of plastic are commonly used for high efficiency appliance venting. This vent pipe is connected to the shared vent stack with the furnace. This combination of carbon dioxide and water would damage the type of vents used in conventional systems which run vertically out of a home.

This high efficiency venting system must be installed when you install the new furnace. 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. These pvc pipes are connected to the furnace and expelled outside. The gas vent pipe from the water heater tank is improperly sloped.

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. Insulating pipe is important to avoid condensate icing. Cloth duct tape is not permitted to be installed on fuel burning appliance vent pipes. That s because the combustion byproducts are in a gaseous form so the gases can float up through the flue pipe and out of your roof.

Many municipalities do not allow metal foil tape either. That depends on whether you have a standard efficiency or a high efficiency furnace. 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. There is a disconnection at the elbow.