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Heat & Glo • 350TRSI-AUF, 350TRSILP-AUF • 2089-980 Rev. o • 6/12
38
A. Pipe Clearances to Combustibles
WARNING!Riskof Fire!Maintain air space clearance
to vent. DONOT pack insulation or other combustibles:
• Between ceiling restops
• Between wall shield restops
• Around vent system
Failure to keep insulation or other material away from
vent pipe may cause over heating and re.
8
Vent Clearances and Framing
Figure 8.2 Wall Penetration
* Shows center of vent framing hole for top or rear venting. The center of the
hole is one 25.4 mm above the center of the horizontal vent pipe.
Figure 8.1 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 restop(s). The wall shield
restop maintains minimum clearances and prevents cold
air inltration.
• The opening must be framed on all four sides using the
same size framing materials as those used in the wall
construction.
• DVP pipe - A wall shield restop is required on one side
only on interior walls. If your local inspector requires a
wall shield restop on both sides, then both wall shield
restops must have a heat shield (refer to Section
16.B.) attached to them.
• SLP pipe - A wall shield restop must be placed on each
side of an interior wall. A minimum 1-1/2 inch (38 mm)
overlap of attached heat shields must be maintained.
• See Section 10.H. 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 restop is only required on one side and no heat
shield is necessary.
* When using SLP pipe, minimum clearances from the vent pipe to combustible
materials at inside wall firestops are: Top: 2-1/2 in. (64 mm)
Bottom: 1/2 in. (13 mm)
Sides: 1 in. (25 mm)
(DVP-SLP Pipe Shown)
3 in. (76 mm)
top clearance *
1 in. (25 mm)
clearance
bottom & sides
Heat
Shield
Wall
Shield
Firestop
Heat
Shield
WALL
3 in. (76 mm)
top clearance *
1 in. (25 mm)
clearance
bottom & sides
Heat
Shield
Wall
Shield
Firestop
Heat
Shield
WALL
3 in. (76 mm)
top clearance
1 in. (25 mm)
clearance around
vertical sections
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. (102 mm) the existing heat shields must be field
trimmed. If wall thickness is greater than 7-1/4 in. (184 mm) 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 in. (111 mm) the existing heat shields must be
field trimmed. If wall thickness is greater than 7-5/8 in. (194 mm) a DVP-HSM-B will
be required.
A* B* C D
350TRSI-AUF
350TRSILP-AUF
in. 39-3/4 22-3/8 38-3/4 21-3/8
mm 1010 568 984 541
C
D
A*
B*
10 in.
254 mm
10 in.
254 mm
10 in.
254 mm
12 in.
305 mm
Note: A 152 mm section of straight ue must
be attached to the replace before a 90° elbow.