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6 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: 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 6.1 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 • Cyclone-BN, Cyclone-BC • 2073-900 Rev. N • 10/08
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 8.L. for information for regarding the instal-
lation of a horizontal termination cap.
Non-Combustible Wall Penetration
If the hole being penetrated is surrounded by noncombus-
tible 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.
* TO CENTER OF
FRAMING HOLE
SL Pipe Clearances to Combustibles
A
Inches
10
mm
254
Figure 6.2 Exterior Wall Hole
A
Do NOT pack
with insulation or
other materials.
B
C*
B
C
10
66-1/2
254
1689
17
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