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12
A. ............. 42
B........ 38 1/2
C.............. 22
D.............. 42
Figure 3. Framing Dimensions
Framing should be
constructed of 2 X 4
lumber or heavier.
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.