Description

Guidelines for Sizing SmartFlex Liners & Single Appliances

Please Note: These are general guidelines for sizing a single appliance liner, and there are many other factors and considerations to take into account when working on the job site. Please contact our qualified Sales Team for more information.

From the chart below, the top row will determine the Liner Diameter needed - use the first column and choose your Chimney Height, then moving across the chart, choose the Max. BTU's of the unit being vented.

Example: A 10' tall chimney, with a single appliance maximum BTU between 155,200 & 217,600 will require a 7" diameter liner.

Single Appliance	4”	5”	6”	7”	8”	9”	10”
6’	52,800	83,200	124,800	170,400	227,200	294,400	362,400
10’	64,000	102,400	155,200	217,600	283,200	364,800	447,200
15’	74,400	119,200	179,200	251,200	320,000	434,400	538,400
20’	79,200	132,000	198,400	275,200	374,400	488,800	603,200
30’	88,800	146,400	223,200	313,600	426,400	558,400	690,400
50’	96,800	164,000	249,600	354,400	490,400	648,800	805,600