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The Exhausto Fan
To find which Exhausto Fan to order, first find the flue type of the appropriate size flue from this chart.
Common Flue Types
Round Square Rectangular
Size Type Size Type Size Type
6" |
A | 6" x 9" Type A | 6" x 10" C |
| 7" | B | 7" x 7" Type B | 7" x 11" C |
| 8" | C | 8" x 8" Type C | 8" x 12" C |
| 9" | C | 9" x 9" Type D | 9" x 13" D |
| 10" | C | 10" x 10" Type D | 10" x 14" D |
| 11" | D | 11" x11" Type D | 11" x 15" F |
| 12" | D | 12" x 12" Type D | 12" x 16" F |
| 13" | E | 13" x 13" Type F | 13" x 18" F |
| 14" | F | 14" x 14" Type F | 14" x 19" F |
| 15" | F | 15" x 15" Type F | 15" x 20" F |
| 16" | F | 16" x 16" Type F | 17" x 17" F |
Figure the fireplace opening size in square inches. Multiply the width times the height. In this chart go to the far left column and find the flue type (A-F). Then follow the line across to the appropriate Exhausto Fan Model.
Which Exhausto Fan To Use For Woodburning Fireplaces
| Flue Type | 1-500 Sq " | 501-800 Sq" | 801-1200 Sq" | 1201-1900 Sq" | 1901-5000Sq" |
A |
RS-9 | RS-14 | NA | NA | NA |
| B | RS-9 | RS-12 | RS-16 | NA | NA |
| C | RS-9 | RS-12 | RS-14 | RS-16 | NA |
| D | RS-9 | RS- 9 | RS-12 | RS-14 | RS-16 |
| E | RS-12 | RS-12 | RS-12 | RS-14 | RS-16 |
| F | RS-12 | RS-12 | RS-12 | RS-12 | RS-16 |
Example: A 12" x 12" square flue size (seven lines down middle column, in Common Flue Types chart) is a type "D". If your fireplace opening size is in the 801-1200 sq inch range, order a Model RS-12 Exhausto Fan.
Important note: For woodburning stoves and inserts having a door opening size of less than 300 sq inches, use a model RS-9 Exhausto Fan.
