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Heat & Glo • Crescent II • 2083-902 Rev. G • 9/0516
A. Pipe Clearances to Combustibles
Vent Clearances and Framing
6
Combustible Wall Penetration
Frame a hole in a combustible wall for an interior wall shield,
(Figure 6.2) whenever a wall is penetrated. Use same size
framing materials as those used in the wall construction.
The wall shield maintains minimum clearances and pre-
vents cold air infiltration.
Non-Combustible Wall Penetration
If the hole being penetrated is surrounded by noncombus-
tible materials such as concrete, a hole with diameter one
inch greater than the pipe is acceptable.
Fire Risk.
Explosion Risk.
Maintain vent clearance to combustibles
as specified.
WARNING
• Do not pack air space with insulation or
other materials.
Failure to keep insulation or other materials
away from vent pipe may cause fire.
B. Wall Penetration Framing
Figure 6.1 Pipe Clearances
1 in. CLEARANCE
AROUND VERTICAL
SECTIONS
3 in. TOP
CLEARANCE
1 in. SIDE AND
BOTTOM CLEARANCE
Figure 6.2 Exterior Wall Hole
* Shows center of vent framing hole for top venting.
The center of the hole is one (1) inch (25.4mm)
above the center of the horizontal vent pipe.
NOTE: No
slope required.
40-7/8 in.*
39-7/8 in.