Chimney Pipe Hole Size

Btu input maximum ratings height dimensions other factors.

Chimney pipe hole size.

Dp ch pressure draft in the chimney pa h height of chimney m ρ o ambient outside density of air kg m 3 ρ i inside chimney density of air kg m 3 a g acceleration of gravity 9 81 m s 2 since the ideal gas law. The pan s hole should be approximately a 1 2 inch larger than the chimney pipe s outer wall. When plumbing pipes and chimneys have to go through sloped roofs they are always cut fairly large just to make sure that the pipe will pass through. Chimney size specification requirements for chimney flues and vents diameter height etc flue diameter and height requirements for category i draft hood and fan assisted appliances.

A chimney bowl should be about about 50 taller than that of its classic billiard counterpart. Then shine a bright flashlight through the pipe from the. A pipe with a seven inch inner diameter for example requires a seven inch chimney cap. Dp ch h ρ o ρ i a g 1 where.

Any and all colors and finishes that can be found for the billiard suit the chimney just the same. The way wood stoves and fireplaces work a correct match on fitting the flue size to the appliance is a must. Select angle increment and hit full set to generate and print a full set of oval templates for currently entered pipe diameter. Cut and use template to mark and cut sheet to fit pipe at angle.

The diameter of the chimney cap you choose needs to be the same as your pipe s inner diameter. To find pipe end shape not hole in sheet enter 0 for sheet thick. The problem is that a 3 inch round pipe needs an oval hole in a sloped roof. As a general rule the diameter of the chimney should match the flue collar on your wood stove.

It should have a formed or welded collar standing at least 3 4 of an inch tall. There is an easy trick for drawing out the hole. The diameter of the bowl remains the same for the most part as do the lengths of the shank and stem. Hold the pipe in place and run it up close to the roof decking.

Tables of metal masonry chimney flue vent sizes vs. The pressure difference or chimney draft can be expressed as. This collar prevents water from rolling back into the chase along the chimney pipe.