Undersized liners will not allow the appliance to vent properly.
Fireplace liner sizing guide.
In the example they use a 36 width.
Open fireplace liner sizing guide the chart below uses a 10 1 ratio.
The rules are this for an interior chimney within the building envelope the liner must only be insulated if the chimney flue is greater than 3 times the area cross section not total area of the chimney liner area.
Steps to calculate a fireplace liner size.
A 10 1 ratio should be used for chimneys less than 25 feet in height and a 12 1 ratio for chimneys greater than 25 feet in height.
Height ft step 2.
Figure the opening for the fireplace.
Anon ratio of fireplace opening dimension to chimney flue size a reasonable rule of thumb giveing the ratio of fireplace opening size to the cross sectional area of the fireplace flue vent opening is 10 to 1.
Area length x width 12.
The federal hous ing administration fha requires flue liners 1 8 the area of the fire place opening if the chimney is less than 15 feet tall 1.
In the example above they use 30.
For an exterior chimney the liner must be insulated if the chimney area is 2 times the area of the liner.
For single appliances this will be all you need to choose to get the correct size and type of liner for your application.
Gas burning should use 316l 316ti or al29 4c stainless steel chimney liners.
Up to 600 sq.
Measure the exhaust collar of the appliance.
10 of the fireplace opening area but with a minimum size specified.
Not all stainless steel chimney liners are considered all fuel liners.
Measure the height and width of your fireplace opening inside your home.
Area length x width.
The ideal flue size is typically determined by the exhaust outlet of the stove or appliance.
Find the width of the fireplace opening on the chart look for step 1 at right.
Figure the opening for the fireplace.
This can cause smoke to pour out of the stove and it can also cause gas and oil appliances to fail.
9 601 760 sq.
Find the height of the fireplace opening.
Area length x width x 1 2.
Measure the height of your chimney from the top crown of your chimney to the top of the smoke chamber inside your chimney.
Sizing tables 12 multiple appliance vents procedure 15 sizing tables 16 additional guidelines 19 multiple story venting sizing guidelines 21 system examples 22 factory built all fuel chimney systems includes flexible stainless liner sizing description 26 sizing tables 27 table of contents.
Find the intersect of.
Determining fireplace liner sizing.
The rule of thumb for sizing a chimney liner is that you never want it to be smaller than the appliance exhaust hole and you don t want the liner to be three times the area of the exhaust hole of the appliance.
