Venting Installation
Continued
|
| Return | Return |
|
|
| Elbow | Elbow |
|
Offset |
| Offset | Return |
|
Elbow |
| Elbow |
| |
| Elbow |
| ||
| 6' Max. | 6' Max. Ceiling |
| |
|
|
| ||
Return |
|
| Support Pipe |
|
| Return | 6' Max. | ||
Elbow |
| |||
|
| |||
|
| Elbow |
|
|
6' Max. | Offset |
|
Offset |
| |
Elbow | 6' Max. Elbow | 6' Max. |
Offset |
|
|
Elbow |
|
|
A | B | C |
Figure 12 - Typical Offset Terminations
Firestop Spacers
Firestop spacers are required at each point where the chimney penetrates a floor space. Their purpose is to establish and maintain the required clearance between the chimney and the combustible materials. When the pipe passes through a framed opening into a living space above, the firestop must be placed onto the ceiling from below as shown in Figure 13.
They also provide complete separation from one floor space to another or attic space as required by most codes. When the double wall pipe passes through a framed opening into an attic space, the firestop must be placed into an attic floor as shown in Figure 14.
Existing
Ceiling
Frame
Firestop Spacer
Screws or Staples (Min. of 8)
Figure 13 - Firestop Spacer with Living
Space Above Ceiling
Screws or Staples
Firestop(Min. of 8) Spacer 
Existing |
Ceiling |
Frame |
Figure 14 - Firestop Spacer with Attic
Space Above Ceiling
Penetrating the roof
To maintain a 1" (36" Models) or 2" (42/50" Models) clearance to the pipe on a roof with a pitch, a rectangular opening must be cut.
1.Determine center point through which pipe will penetrate roof.
2.Determine center point of roof. Pitch is distance the roof drops over a given span, usually 12". A 6/12 pitch means that roof drops 6" for each 12" measured horizon- tally down from roof rafters.
3.Use roof opening chart (Figure 15, page
11)to determine correct opening length and flashing required.
4.Remove shingles around opening mea- sured. Cut out this section.
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