High Efficiency Furnace Venting Freezing At Roof Vent

There is a disconnection at the elbow.

High efficiency furnace venting freezing at roof vent.

This high efficiency venting system must be installed when you install the new furnace. Cloth duct tape is not permitted to be installed on fuel burning appliance vent pipes. 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. The gas vent pipe from the water heater tank is improperly sloped.

If your furnace has an afue rating below 90 percent it will most likely have a flue pipe that goes up through your roof. 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. 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. 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. These pvc pipes are connected to the furnace and expelled outside. This combination of carbon dioxide and water would damage the type of vents used in conventional systems which run vertically out of a home. These types of furnaces have a dedicated pipeline that runs directly from an outside vent into a sealed combustion chamber of the furnace and a sealed vent to the outside of the home for venting the toxic fumes from the combustion process.

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. Insulating pipe is important to avoid condensate icing. That depends on whether you have a standard efficiency or a high efficiency furnace.