Venting Installation
Continued
Maximum length of pipe between supports is 6' of angle run. Maximum of two 6' angle run sections per chimney system (see Figure 9, page 8).
Support
Required
2" (5.1cm) Minimum
Angled Firestop
Ceiling
Support
Straps
30 FT. | 30 FT. | Return |
(9.14m) | (9.14m) | Elbow |
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| Elbow | |
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| Figure 15 - Elbow Offset |
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| OFFSET |
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| RISE | CHIMNEY LENGTH | |||
| A |
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| B | 48" | 36" | 18" | 12" |
| 4 3/8" | 16 3/8" | ELBOW SET ONLY | |||||
| 9 1/2" | 25 1/4" |
| 1 |
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| 12 1/2" | 30 3/8" |
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| 1 |
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| 14 3/8" | 34" |
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| 2 | ||
| 17 5/8" | 39 1/4" |
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| 1 | 1 | ||
| 21 1/2" | 46" |
| 1 |
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| 22 3/4" | 48 1/8" |
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| 1 | 2 | ||
| 26 3/8" | 54 7/8" | 1 |
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| 26 3/8" | 60" |
| 1 | 1 |
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| 31 3/4" | 63 3/4" | 1 |
| 1 |
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| 34 3/4" | 69" | 1 |
| 1 |
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| 38 5/8" | 75 5/8" |
| 2 |
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| 39 7/8" | 77 7/8" | 1 |
| 1 | 1 | ||
| 43 3/4" | 84 1/2" | 1 | 1 |
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| 46 3/4" | 87 3/4" |
| 2 | 1 |
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| 48 7/8" | 93 3/8" | 2 |
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OFFSET CHART
Screws
B
A
Figure 16 - Rise and Offset
Figure 17 - Chimney Supports
RETURN
RETURNELBOW ELBOW
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| 6' MAX | |
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| (15.2cm) | |
6' MAX | CEILING |
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(15.2cm) |
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SUPPORT |
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| PIPE | OFFSET | |
OFFSET | |||
ELBOW | |||
ELBOW | 6' MAX | ||
(15.2cm) | |||
RETURN | |||
| RETURN | ||
ELBOW |
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| ELBOW | ||
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6' MAX |
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(15.2cm) |
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| 6' MAX | 6' MAX | |
| (15.2cm) | (15.2cm) | |
OFFSET
ELBOW
Figure 18 - Typical Offset Installations
Firestop Spacers
Firestop spacers are required at each point where the chimney penetrates a floor or ceiling joist 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 19, page 9.
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 20, page 9.
When penetrating a floor or ceiling at an
angle, use firestop spacer number 30 FS-
10D (see Replacement and Accessory Parts, page 15).
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