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31Heatilator • GDST3831I • 2127-900 Rev. K • 7/12
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 overheating and fi re.
8
8
Vent Clearances and Framing
Figure 8.2 Wall Penetration
* 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.
B
A*
10 in.
10 in.
A* B
38-7/8 in. 37-7/8 in.
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
1/2 in. (13 mm) bottom
clearance at wall
shield firestops
1 in. (25 mm)
clearance
bottom and sides
Heat
Shields
Wall
Shield
Firestop
WALL
3 in. (76 mm)
top clearance
1 in. (25 mm)
clearance around
vertical sections
Figure 6.1 Horizontal venting clearances to combustible
materials
B. Wall Penetration Framing
Combustible Wall Penetration
Whenever a combustible wall is penetrated, you must
frame a hole for the wall shield fi restop. 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.
• SLP pipe - 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.L. 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.