Shows center of 12” x 12” vent 
framing hole for top and rear venting. The center of the hole is one inch (25.4mm) above the
center of the horizontal vent pipe.
A. | ............. 42” |
B. | ....... 38 1/2” |
C. | ............. 22” |
D. | ............. 42” |
Framing should be constructed of 2 X 4 lumber or heavier.
Figure 3. Framing Dimensions
12
