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6
Vent Clearances and Framing
A. Pipe Clearances to Combustibles
WARNING
Fire Risk.
Explosion Risk.
Maintain vent clearance to combustibles as
specifi ed.
• Do not pack air space with insulation or
other materials.
Failure to keep insulation or other materials
away from vent pipe may cause fi re.
NOTE: Slope
3 in. TOP
not required.
CLEARANCE
1 in. CLEARANCE
AROUND VERTICAL
SECTIONS
Figure 6.1 Pipe Clearances
HEAT
SHIELD
WALL
SHIELD
FIRESTOP
Figure 6.2
Horizontal Venting Clearances to
Combustible Materials
1 in. SIDE AND
BOTTOM CLEARANCE
3 in. TOP
CLEAR ANCE
HEAT
SHIELD
1 in. CLEAR ANCE
BOTTOM & SIDES
WALL
Hearth & Home Technologies, Inc. • Bravo, Aztec • InD • 703-900 Rev. N • 8/06
B. Wall Penetration Framing
10 in.
12 in.
A
77 in.
* 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.
Figure 6.2
Exterior Wall Hole
Combustible Wall Penetration
Frame a hole in a combustible wall for an interior wall
shield fi restop, (Figure 6.2) whenever a wall is penetrated.
Use same size framing materials as those used in the wall
construction. The wall shield fi restop maintains minimum
clearances and prevents cold air infi ltration.
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.
B
A*
B
76 in.
17
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