Heat & Glo • Bravo • 704-902 Rev. J • 10/10
27
A. Pipe Clearances to Combustibles
WARNING! Risk of Fire!
Maintain air space clearance to
vent.
DO NOT pack insulation or other combustibles:
• Between ceiling fi
restops
• Between wall shield fi
restops
• Around vent system
Failure to keep insulation or other material away from
vent pipe may cause over heating and
fi
re.
8
Vent Clearances and Framing
B. Wall Penetration Framing
Combustible Wall Penetration
Whenever a combustible wall is penetrated, you must
frame a hole for the wall shield fi restop(s). The wall shield
fi restop maintains minimum clearances and prevents cold
air infi ltration.
• The opening must be framed on all four sides using the
same size framing materials as those used in the wall
construction.
• A wall shield fi restop is required on one side only on in-
terior walls. If your local inspector requires a wall shield
fi restop on both sides, then both wall shield fi restops
must have a heat shield (refer to Section 16.B) attached
to them.
• See Section 10.J. for information for regarding the in-
stallation of a horizontal termination cap.
Non-Combustible Wall Penetration
If the hole being penetrated is surrounded by noncom-
bustible materials such as concrete, a hole with diameter
one inch greater than the pipe is acceptable.
Whenever a non-combustible wall is penetrated, the wall
shield fi restop is only required on one side and no heat
shield is necessary.
Figure 8.1 Pipe Clearances
1 in. CLEARANCE
AROUND VERTICAL
SECTIONS
3 in. TOP
CLEARANCE
1 in. SIDE AND
BOTTOM CLEARANCE
HEAT
SHIELD
HEAT
SHIELD
1 in. CLEARANCE
BOTTOM & SIDES
WALL
WALL
SHIELD
FIRESTOP
3 in. TOP
CLEARANCE
Figure 8.2 Horizontal Venting Clearances to Combustible
Materials
NOTE
: Heat shields MUST overlap by a minimum of 1-1/2 in. (38 mm).
The heat shield is designed to be used on a wall 4 in. to 7-1/4 in.
(102 mm to 184 mm) thick.
If wall thickness is less than 4 in. (102
mm) the existing heat shields must be fi eld trimmed. If wall thickness is
greater than 7-1/4 in. (184 mm) a DVP-HSM-B will be required.
Figure 8.3 Exterior Wall Hole
* Shows center of vent framing hole for top venting. The center of the hole is
one (1) inch (25.4 mm) above the center of the horizontal vent pipe.
A*
B
87-3/4 in.
86-3/4 in.
B
A*
10 in.
12 in.