Gas Furnace Flue Pipe Size

But chimney experts and draft measurements show that in a rectangular flue not all of the cross sectional area is equally effective in developing draft.

Gas furnace flue pipe size.

Well the flue which is a term referring to the vent pipe is basically the important component from the furnace that will transport the emission from the combustion heating process to the outside area of the house. Not only are we trained but we are licensed and insured. In the manual it says you can run 1 1 2 pvc for 50 feet not including elbows. The size of a flue pipe is determined by the distance from the heater to the termination point of the flue.

It would be best if you let a trained professional install this for you. Depending on the manufacturer s instructions or the building department s. A 11 4 in pipe is recommended for higher inputs. What type gas are you using.

My question is this would it do any harm not work if i ran 2 pvc. I ll have 20 30 foot total counting elbows. Measure you will need to measure how far it is from the furnace to the old flue on the side of the chimney. The gas line from the supply should serve only a single unit.

Do not run your stove vent pipe through your bathroom vent pipe because the pipe for the furnace will build up heat and the methane gas is flammable. To make it simple if you have a gas water heater with a 3 draft hood and a furnace with a 4 flue collar connected to the same chimney flue you d calculate that chimney flue size based on the 3 draft hood the smaller of two. A flue that is too large allows too much air to circulate making it difficult for the warm gas and vapors exiting the furnace to create a strong updraft up and out of the vent. Before we leave the shop let s check the furnace to get the rating flue collar size and the installation instructions.

The inlet gas supply pipe size should never be smaller than 1 2 in. How many offsets will there be. In my opinion it d just be easier to run 2 pvc. Well the furnace nametag tells us that the furnace has a rating of 130 000 btu input the collar size is 4 in and the furnace is a natural draft type.

Just muliplying these dimensions together 6 75 x 6 75 45 56 sq in. So let s calculate or why don t we skip those calculations and i ll give you the answers. You don t have to worry about any toxic gas or combustion byproduct that will linger inside the house if you have the flue. Typically furnace vent pipes cannot be within six inches of wood framing and insulated air conditioning ducts.

This is for your protection and. Will any other appliances flue pipe be tying into this one. Generally 1 in supply pipe is adequate for furnace inputs up to 125 000 btu h.