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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 could cause overheating and fire.
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.
(SLP Pipe Shown)
1 in. (25 mm)
clearance
bottom & sides
* 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
Note: Vertical venting requires 1 inch clearance on all
sides of the pipe.
B. Wall Penetration Framing/Firestops
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.
3 in. (76 mm)
top clearance *
Heat
Shield
Heat
Shield
Wall
Shield
Firestop
WALL
Top: 2-1/2 in. (64 mm)
Bottom: 1/2 in. (13 mm)
Sides: 1 in. (25 mm)
Heatilator • ION-V7, ION-S7, ION-H7 Installation Manual • 2276-980 Rev. E • 5/15
• 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.
• See Section 7.F. for information for regarding the instal-
lation of a horizontal termination cap.
Non-Combustible Wall Penetration
If the hole being penetrated is surrounded by non-com-
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.
WARNING! Risk of overheating! Install appliance a
minimum of 4 inches off of finished floor.
•
Convection air flow could be compromised and
cause overheating.
• Decorative fronts will not fit properly.
DO NOT PACK WITH
INSULATION OR
OTHER MATERIAL
10-3/16 iN.
C
A
in.
ION-V7
mm
in.
= 4 in.min.
ION-S7
(102 mm)
mm
in.
ION-H7
mm
* Shows center of vent framing hole for 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
B
A
12 IN.
FINISHED
FLOOR
B
C*
28-1/2
724
C=(A + B) +1 in.
26
660
(1 in. =25 mm)
21-1/2
546
27
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