CORRECT | COMBUSTIBLE SURFACE | INCORRECT |
| ||
| DIRECTION |
|
| UP |
|
| HEAT SHIELD |
|
| 90º ELBOW |
|
Figure 8.3 |
|
|
•If the combustible materials are not in place at the time of install the elbow heat shield may be screwed to the exhaust pipe (see Figure 8.4). Cut the tabs as shown and bend down. Secure the heat shield to the pipe maintaining 3 inch to 4 inch between the pipe and shield.
SCREW |
3 in. |
(76 mm) |
Figure 8.4 |
C. 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
•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.M 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 inch greater than the pipe is acceptable.
Whenever a
10 in. | 12 in. | C |
|
| |
|
| D |
10 in. | 12 in. |
|
A* B*
A* | B* | C | D |
| 28 in. |
| 27 in. |
*Shows center of vent framing hole for top or rear venting. The center of the hole is one (1) inch (25.4 mm) above the center of the horizontal vent pipe.
Figure 8.5 Wall Penetration
Note: When terminating horizontally off the top of the unit using SLP pipe, a 10 in. x 10 in. framing hole is required.
Heat & Glo • | 37 |
