How do I know what size DIAMETER & LENGTH liner I need?Water Heaters and Oil Furnaces For Hot Water Heaters and Oil Furnaces the ideal diameter of the liner needed to vent your appliance is the size on your unit. For example, if it has a 6" opening where the pipe is to be inserted, that is the ideal size liner you need. However, the interior of your chimney (especially after insulating) may not have the adequate space. With the use of an increaser / reducer, according to the safety codes, you may be able to go up or down one size and your unit should still function appropriately. To measure the length you need, measure from the top of the chimney flue tile or crown, down to the thimble where the liner will come through your wall to hook up to your appliance. Fireplaces For your Fireplace, you need to calculate the maximum size flue liner you can install. At the chimney crown, on your roof, you need to measure the inside diameter of your existing flue opening. Next, inside your home, measure the height and width of your fireplace opening. Refer to our Fireplace Sizing Chart to help you find the liner diameter size you need. Woodstove, Corn or Wood Pellet Stove If you are relining for a Woodstove, Corn or Wood Pellet Stove you need to measure from the top of the chimney crown down to where you will hook-up the stove. For the diameter liner size, you will need to measure the inside dimension of the exhaust on your stove. |
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