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
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. |
• SLP pipe - A wall shield firestop must be placed on each | |
| side of an interior wall. A minimum |
| overlap of attached heat shields must be maintained. |
• | See Section 10.G for information for regarding the in- |
3 in. (76 mm) top clearance
1 in. (25 mm) clearance around vertical sections
Heat | |
Shield | top clearance |
| Heat |
| Shield |
1 in. | 1/2 in. (13 mm) |
(25 mm) | |
bottom | clearance |
clearance | bottom & sides |
Wall |
|
Shield |
|
Firestop WALL |
|
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 inch greater than the pipe is acceptable.
Whenever a
Figure 8.1 Horizontal Venting Clearances To Combustible
Materials
10 in.
(254 mm)
A
10in.
(254 mm)
B
A* | B |
38 in (971 mm) |
*Shows center of flue framing hole. The center of the hole is 1 in. (25 mm) above the center of the horizontal flue pipe.
Figure 8.2 Wall Penetration
Heat & Glo • | 33 |