6 Vent Clearances and Framing
A. Pipe Clearances to Combustibles | B. Wall Penetration Framing |
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.
NOTE: No | 3 in. TOP |
CLEARANCE | |
slope required. | |
1 in. CLEARANCE | |
AROUND VERTICAL | |
| SECTIONS |
| 1 in. SIDE AND |
| BOTTOM CLEARANCE |
Figure 6.1 | Pipe Clearances |
39-7/8 in.
40-7/8 in.*
*Shows center of vent framing hole for top venting. The center of the hole is one (1) inch (25.4mm) above the center of the horizontal vent pipe.
Figure 6.2 Exterior Wall Hole
Combustible Wall Penetration
Frame a hole in a combustible wall for an interior wall shield, (Figure 6.2) whenever a wall is penetrated. Use same size framing materials as those used in the wall construction. The wall shield maintains minimum clearances and pre- vents 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.
16 | Heat & Glo • Crescent II • |