8 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 may cause over heating and fire.
Note: Heat shields MUST overlap by a minimum of
•SLP heat shield - designed to be used on a wall
•If wall thickness is less than
Heat
wall shield firestops
3 in. (76 mm) top clearance
B. Wall Penetration Framing
Combustible Wall Penetration
Whenever a combustible wall is penetrated, you must frame a hole for the wall shield firestop. 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.
•SLP pipe - A wall shield firestop must be placed on each side of an interior wall. A minimum
•See Section 10.L. for information for regarding the in- stallation of a horizontal termination cap.
Non-Combustible Wall Penetration
If the hole being penetrated is surrounded by noncom- bustible materials such as concrete, a hole with diameter one in. greater than the pipe is acceptable.
Whenever a
1 in. (25 mm) clearance around vertical sections
Wall
Shield
Firestop
1 in. (25 mm) clearance bottom and sides
1/2 in. (13 mm) bottom clearance at wall shield firestops
WALL
shield is necessary.
10 in. 10 in.
Figure 6.1 Horizontal venting clearances to combustible materials
B
A*
A* | B |
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*Shows center of vent framing hole for top venting. The center of the hole is one (1) inch (25.4 mm) above the center of the horizontal vent pipe.
Figure 8.2 Wall Penetration
Heatilator • GDST3831I • | 31 |