RS Chimney Fan size Selection Tables
for Wood and Gas Fired Fireplaces and Stoves
Use of the following fan selection tables requires that you understand how to calculate or determine the area of opening a fireplace opening and a flue system.
The "opening in square inches" refers to the fireplace or appliances over-all face opening.

Example :  In a small wood burning fireplace, if the hearth opening is 18" x 24" with an 8" round clay liner in a brick and mortar chimney we would...

Multiply the length and width, in this case 18" x 24" = 432 square inches.  Being less than 500 on the chart below, follow the column to the 8" flue size.  Highlighted in red, the chart shows an RS 9 to be the proper size chimney fan for this application.

If you have a square or rectangular liner...See the conversion chart below.
Chimney Fans for:
CONVERSION OF
Rectangular / Square to Round Flues
Ex...  8 x 12" clay liner is equivalent to
8 (dim. A) - 12 (dim. B) = 10 (10" Round)