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5 5
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 firestops
• Between wall shield firestops
• Around vent system
Failure to keep insulation or other material away from
vent pipe may cause over heating and fire.
WARNING! Risk of Fire! Elbow heat shield required
when V
= 2 ft. or less. Clearances to combustibles must
1
be maintained. See Figure 4.10.
Note: Heat shields MUST overlap by a minimum of 1-1/2 in. (38 mm).
• DVP heat shield - 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. the existing heat shields must be field trimmed. If
wall thickness is greater than 7-1/4 in. a DVP-HSM-B will be required.
• 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.
(DVP-SLP Pipe Shown)
Heat
3 in. (76 mm)
Shield
Elbow
top clearance min.
Heat
Shield
1 in. (25 mm)
clearance around
vertical sections
V1
Firestop
Warning! Risk of Fire: Elbow heat shield required with 3 inch top
clearance or V1 of 2 ft. or less.
* When using SLP pipe, minimum clearances from the vent pipe to combustible
materials at inside wall firestops are:
Figure 5.1 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 firestop(s). The wall shield
firestop maintains minimum clearances and prevents cold
air infiltration.
• 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 firestop 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.
Heat & Glo • 6000CMOD-IFT, 8000CMOD-IFT Installation Manual • 2509-980 Rev. L • 6/20
3 in. (76 mm)
top clearance *
Heat
Shield
1 in. (25 mm)
clearance
Wall
bottom & sides
Shield
WALL
Top: 2-1/2 in. (64 mm)
Bottom: 1/2 in. (13 mm)
Sides: 1 in. (25 mm)
• DVP pipe - A wall shield firestop is required on one side
only on interior walls. If your local inspector requires a
wall shield firestop on both sides, then both wall shield
firestops must have a heat shield (refer to Section
12.A.) attached to them.
• See Section 7.G for information for regarding the instal-
lation 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 firestop is only required on one side and no heat
shield is necessary.
Note: A 6 inch (152 mm) section of straight pipe is required on
all 6000CMOD-IFT/8000CMOD-IFT installations to allow the
vent pipe to align with wall penetration framing. The 6 inches
is included in the A* and B dimensions in the chart below.
DO NOT PACK HOLE
WITH INSULATION OR
OTHER MATERIAL.
10 in.
12 in.
A*
A*
in.
48-3/4
6000
mm
1238
in.
51-1/8
8000
mm
1299
* Shows center of vent framing hole for top vent. The center of the hole is one
(1) in. (25 mm) above the center of the horizontal vent pipe.
Figure 5.2 Wall Penetration
B
B
47-3/4 in.
1212
50-1/8
1273
29
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