Flue Vents For Chimneys

When venting two appliances separately into a common chimney always install the smaller flue pipe appliance with lowest gph input at a higher point into the chimney than the larger flue pipe for the appliance with the largest gph input.

Flue vents for chimneys.

Ducts pipes vents and even chimneys can all be considered types of flues. For the venting of oil fired appliances to masonry chimneys the resizing shall be in accordance with nfpa 31. The purpose of the flue is to protect the rest of the home from the heat of the byproducts of combustion caused by a fire. Refer to figure 2.

A flue is simply a passage for conveying exhaust gases from an appliance to the outdoors. Flue the term flue refers to the passage by which smoke gas or products of combustion are moved to the outdoors. The chimney or vent shall be resized as necessary to control flue gas condensation in the interior of the chimney or vent and to provide the appliance or appliances served with the required draft. The area around the flue piping should be sealed where it enters the chimney.

Gas or oil fired side wall power vents are provided by several manufacturers listed at the end of this article. This can cause confusion as many view flues not just as a passage for venting but as a safe passage for venting. Direct venting or side wall vent chimney and flue systems are a method of venting the exhaust gases from a heating appliance directly out through the side wall of a building while eliminating the need for a vertical chimney of any sort. A flue may be a duct pipe vent or chimney.

An unlined chimney is technically a flue even though an unlined chimney is a fire hazard.