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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.
(DVP Pipe Shown)
Heat
Shield
3 in. (76 mm)
top clearance
1 in. (25 mm)
clearance around
vertical sections
Figure 5.1 Horizontal Venting Clearances To Combustible
Materials
Heat & Glo • MEZZO36-B/ST-B, MEZZO48-B/ST-B, MEZZO60-B/ST-B, MEZZO72-B/ST-B Installation Manual • 2300-973 Rev. R • 12/18
3 in. (76 mm)
top clearance *
Heat
Shield
1 in. (25 mm)
clearance
Wall
bottom & sides
Shield
Firestop
WALL
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.
• DVP 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 main-
tained.
• 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.
Note: Do not pack the gap with insulation.
Whenever a non-combustible wall is penetrated, the wall
shield firestop is only required on one side and no heat
shield is necessary.
DO NOT PACK WITH
INSULATION OR
OTHER MATERIAL
12 in.
10 in.
A
MODEL
MEZZO36-B
MEZZO36ST-B
MEZZO48-B
MEZZO48ST-B
MEZZO60-B
MEZZO60ST-B
MEZZO72-B
MEZZO72ST-B
* Shows center of vent framing hole for top venting. The
center of the hole is one (1) in. (25.4 mm) above the
center of the horizontal vent pipe.
Note:
Measurements were taken with a 2 ft. vertical section of pipe directly
off the top of appliance.
Figure 5.2 Wall Penetration
B
A*
B
64 in.
63 in.
1.63 m
1.60 m
76 in.
75 in.
1.93 m
1.90 m
31
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