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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).
• 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
Warning! Risk of Fire: Elbow heat shield required with 3-6 inch top
clearance or less and/or V1 of less than 1-1/2 ft.
Heat
Shield
* 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
34
Hearth & Home Technologies • DV3732-B, DV3732L-B, DV4236-B Installation Manual • 2496-980 Rev. M • 10/19
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 *
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)
Elbow Heat Shield
WARNING! Risk of Fire! Elbow heat shield MUST be
installed if required. Overheating will occur.
Top vented appliances: Installation of the elbow heat
shield is required when the clearance to combustible ma-
terial above the first 90 degree vent elbow is six inches or
less. See Figure 5.2.
Note: A minimum of three inches clearance from the top
of the pipe to any combusible material must always be
maintained.
ELBOW HEAT SHIELD
Figure 5.2 Conditions Requiring Elbow Heat Shield Installation
To Install Elbow Heat Shield:
1. Remove the elbow heat shield from the shipping posi-
tion by removing screws.
2. Fasten the shield in place using the four pilot holes.
The shield should be oriented such that the 13 1/8 inch
dimension (longest dimension) is running in the same
direction the elbow is pointing. The shield should be
centered directly above the elbow, and positioned so
that it creates a 1/2 inch airspace between the shield
and the combustible surface. See Figure 5.3.
CORRECT
COMBUSTIBLE SURFACE
HEAT SHIELD
Figure 5.3
COMBUSTIBLE
SURFACE
= 6 IN. (152 mm)
OR LESS
INCORRECT
DIRECTION
UP
90º ELBOW
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