29
Heat & Glo • Cerona-36, Cerona-42 • 2106-900 Rev. Q • 8/14
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 may cause over heating and fire.
8
Vent Clearances and Framing
Figure 8.2 Wall Penetration
Figure 8.1 Horizontal Venting Clearances To Combustible
Materials
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.
• 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 Pipe Shown)
3 in. (76 mm)
top clearance *
1 in. (25 mm)
clearance
bottom & sides
Heat
Shield
Wall
Shield
Firestop
Heat
Shield
WALL
3 in. (76 mm)
top clearance
1 in. (25 mm)
clearance around
vertical sections
B. Wall Penetration Framing
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 is required on one side
only on interior walls. If your local inspector requires a
wall shield firestop on both sides, then both wall shield
firestops must have a heat shield (refer to Section
16.B.) attached to them.
• See Section 10.J for information for regarding the in
-
stallation 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.
A
B
A
B
Cerona-36
in.
61-1/2
60-1/2
mm
1562
1537
Cerona-42
in.
72
71
mm
1829
1803
Shows center of 10 inch x 12 inch vent framing holes for
top and rear venting. The center of the hole is one (1) inch
(25.4 mm) above the center of the horizontal vent pipe.