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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 could cause overheating 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
Warning! Risk of Fire: Elbow heat shield required with 3 inch top
clearance or V1 of 2 ft. or less.
Heat
Shield
* 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
36
3 in. (76 mm)
top clearance *
Heat
Shield
1 in. (25 mm)
clearance
Wall
bottom & sides
Shield
Firestop
WALL
3 in. (76 mm)
top clearance min.*
Heat
Shield
1 in. (25 mm)
Wall
clearance
Shield
bottom & sides
Firestop
WALL
Top: 2-1/2 in. (64 mm)
Bottom: 1/2 in. (13 mm)
Sides: 1 in. (25 mm)
Heatilator • CNXT4236IFT, CNXT4842IFT Installation Manual • 2515-980 Rev. R • 1/23
The attached insulation has been tested
and approved by Hearth & Home
Technologies and is UL approved.
This insulation may contact the vent pipe.
Figure 5.2 Top Insulation - CNXT4842IFT Models
WARNING! Risk of Fire! DO NOT remove the installed
piece of insulation from the firebox top on CNXT4842IFT
models. Overheating will occur.
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