Fireplace Liner Sizing Guide

10 of the fireplace opening area but with a minimum size specified.

Fireplace liner sizing guide.

Find the height of the fireplace opening. Figure the opening for the fireplace. Measure the height and width of your fireplace opening inside your home. Steps to calculate a fireplace liner size.

Click below to calculate the area needed for fireplace liners of various shapes. In the example above they use 30. Find the intersect of. 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.

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. 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. 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. Gas burning should use 316l 316ti or al29 4c stainless steel chimney liners.

For an exterior chimney the liner must be insulated if the chimney area is 2 times the area of the liner. The ideal flue size is typically determined by the exhaust outlet of the stove or appliance. 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. Up to 600 sq.

Height ft step 2. Find the width of the fireplace opening on the chart look for step 1 at right. The ubc allows round flue liners to be only 1 12 the area minimum 50 square inches but requires 1 10 the area minimum 64 square inches for square or rec tangular liners. Figure the opening for the fireplace.

In the example they use a 36 width. This can cause smoke to pour out of the stove and it can also cause gas and oil appliances to fail. Area length x width x 1 2. 9 601 760 sq.

Area length x width. Measure the exhaust collar of the appliance. Determining fireplace liner sizing. Open fireplace liner sizing guide the chart below uses a 10 1 ratio.

Measure the height of your chimney from the top crown of your chimney to the top of the smoke chamber inside your chimney. Undersized liners will not allow the appliance to vent properly. For single appliances this will be all you need to choose to get the correct size and type of liner for your application. Area length x width 12.