The size and input btuh of each of the appliances being vented the size of the flue vent connector on each of those appliances this will be the bare minimum and is typically the size of the vertical flue vent connector between the appliance.
Gas fireplace flue size.
The way wood stoves and fireplaces work a correct match on fitting the flue size to the appliance is a must.
In most cases you can also step up a size or two for instance a 6 stove could vent into an 8 insulated chimney.
As a general rule the diameter of the chimney should match the flue collar on your wood stove.
A 6 stove should use a 6 chimney or a 7 1 2 x 7 1 2 flue tile.
Fireplace flue size specifications relation of fireplace size to flue opening dimensions table of required chimney flue size and flue dimensions for masonry fireplaces.
Improper flue sizes are a leading cause of poorly drafting fires.
8 1 2 x 8 1 2.
In general your should use the same size chimney diameter as the flue collar on your stove i e.
Stoves fireplaces central heaters.
Venting a wood stove.
To provide adequate draft and safe venting of combustion products the chimney flue for a fireplace has to be adequate in size or cross sectional area.
Flue size common venting uses.
A 6 inch stove requires a 6 inch flue.
How to determine proper flue size.
The size of your flue vent connector or flue pipe needed depends on several variables including.
Outside diameter inches inside area square inches 7 1 2 x 7 1 2.
In most cases a step up is also fine.
8 1 2 x 13.