6 Vent Clearances and Framing
A. Pipe Clearances to Combustibles
WARNING
Fire Risk. Explosion Risk.
Maintain vent clearance to combustibles as specified.
•Do not pack air space with insulation or other materials.
Failure to keep insulation or other materials away from vent pipe may cause fire.
| 3 in. TOP |
| CLEARANCE |
| 1 in. CLEARANCE |
| AROUND VERTICAL |
| SECTIONS |
| 1 in. SIDE AND |
| BOTTOM CLEARANCE |
Figure 6.1 | Pipe Clearances |
Note: Heat shields MUST overlap by a minimum of
The heat shield is designed to be used on a wall 4 in. to
mm)the existing heat shields must be field trimmed. If wall thickness is greater than
B. Wall Penetration Framing
Combustible Wall Penetration
Frame a hole in a combustible wall for an interior wall shield firestop, (Figure 6.3) whenever a wall is penetrated. Use same size framing materials as those used in the wall construction. The wall shield firestop maintains minimum clearances and prevents cold air infiltration.
Non-Combustible Wall Penetration
If the hole being penetrated is surrounded by noncombus- tible materials such as concrete, a hole with diameter one inch greater than the pipe is acceptable.
Whenever a
If your local inspector requires the wall shield firestop on both sides, then both wall shield firestops must have a heat shield attached to them.
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.
B
HEAT
SHIELD
WALL
SHIELD
FIRESTOP
WALL
3 in. TOP
CLEARANCE
HEAT
SHIELD
1 in. CLEARANCE BOTTOM & SIDES
A
|
| A | B | |
in. | ||||
mm | 1562 | 1537 | ||
| ||||
in. | 72 | 71 | ||
mm | 1829 | 1803 | ||
|
Figure 6.2 Horizontal venting clearances to combustible materials
Figure 6.3 Exterior Wall Hole
Heat & Glo • | 19 |
