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8 8
Vent Clearances and Framing
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.
Note: Heat shields MUST overlap by a minimum of 1-1/2 in. (38 mm).
• SLP heat shield - designed to be used on a wall 4-3/8 in. to 7-5/8
in. (111 mm to 194 mm thick).
• If wall thickness is less than 4-3/8 the existing heat shields must be
field trimmed. If wall thickness is greater than 7-5/8 in. a DVP-
HSM-B will be required.
2-1/2 in. (64 mm)
top clearance at
wall shield firestops
3 in. (76 mm)
top clearance
1 in. (25 mm)
clearance around
vertical sections
1 in. (25 mm)
clearance
bottom and sides
Figure 8.1 Horizontal venting clearances to combustible
materials
Heat
Shields
1/2 in. (13 mm) bottom
Wall
clearance at wall
Shield
shield firestops
Firestop
WALL
Heat & Glo • ST-550T-IPI • 2126-900 Rev. H • 3/13
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 must be placed on each side of
an interior wall. A minimum 1-1/2 in. (38 mm) overlap of
attached heat shields must be maintained.
• See Section 10.M. 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 in. 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.
10 in.
10 in.
A
A*
38-7/8 in.
* 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.
Figure 8.2 Wall Penetration
B
B
37-7/8 in.
31
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