Table of Contents
Advertisement
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 fi restops
• Between wall shield fi restops
• Around vent system
Failure to keep insulation or other material away from
vent pipe could cause overheating and fi re.
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.
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).
(DVP-SLP Pipe Shown)
Heat
Shield
3 in. (76 mm)
top clearance
1 in. (25 mm)
clearance around
vertical sections
Firestop
Heat
Shield
Firestop
* When using SLP pipe, minimum clearances from the vent pipe to combustible materi-
als at inside wall firestops are:
Figure 5.1 Horizontal Venting Clearances To Combustible
Materials
Heatilator • GDST4336IFT, GDFL4136IFT Installation Manual • 2480-980 Rev. B • 3/17
3 in. (76 mm)
top clearance *
Heat
Shield
1 in. (25 mm)
clearance
Wall
bottom & sides
Shield
WALL
3 in. (76 mm)
top clearance *
Heat
Shield
1 in. (25 mm)
Wall
clearance
Shield
bottom & sides
WALL
Top: 2-1/2 in. (64 mm)
Bottom: 1/2 in. (13 mm)
Sides: 1 in. (25 mm)
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.
• 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.
• DVP pipe - A wall shield fi restop is required on one side
only on interior walls. If your local inspector requires a
wall shield fi restop on both sides, then both wall shield
fi restops must have a heat shield (refer to Section
12.A.) attached to them.
• See Section 7.G. 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 fi restop is only required on one side and no heat
shield is necessary.
10 in.
12 in.
C
10 in.
12 in.
A*
B*
A*
B*
43-3/4 in.
28 in.
* Shows center of vent framing hole for top or rear venting. The center of the
hole is one (1) inch (25.4 mm) above the center of the horizontal vent pipe.
Figure 5.2 Wall Penetration
D
C
D
42-3/4 in.
27 in.
33
Advertisement
Table of Contents
