United States Stove Hearth Focus 6039HF Owner's Manual page 10

Note: Always check dimensions on unit before cutting hole in wall
3' Minimum
Vertical Pipe
6039HF
COMBUSTION
EXHAUST OUTLET
10 1/16
AIR INTAKE
3' DIA
1 7/8" DIA
12
11 5/8
Dimensional tolerance
±0.25"
10 USSC