424WBST Designer Woodburning Fireplaces
Chimney Requirements - Offset Installations
CHIMNEY FLUE EXIT
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| SECTION |
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| ELBOW |
| 30˚ |
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| RETURN |
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A |
| G | ELBOW |
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| 30˚ | G |
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D |
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| OFFSET |
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E | RISE |
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C | 6 FT. |
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| 30˚ | SKCS8 |
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| H |
| RETURN | SUPPORT |
| OFFSET |
| ELBOW |
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B |
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| OFFSET |
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| ELBOW |
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HEARTH |
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FLOOR |
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Example 1 | Example 2 | Example 3 |
Notes: G + H cannot exceed 20 feet. | FP720 | |
Air Space Clearances: |
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SK8 |
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OFFSET
RISE
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| FP282 |
| 30° Elbow Offsets | ||||||
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| 1' 1¹⁄₂' | 3' | 4' | Chimney Support | Offset | Rise | |
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| 0 | 0 | 0 | 0 | 0 | 3" | 11" |
| 1 | 0 | 0 | 0 | 0 | 8¹⁄₄" | 20" |
| 0 | 1 | 0 | 0 | 0 | 11¹⁄₄" 25¹⁄₄" | |
| 2 | 0 | 0 | 0 | 0 | 13¹⁄₂" 29¹⁄₄" | |
| 1 | 1 | 0 | 0 | 0 | 16¹⁄₂" 34¹⁄₄" | |
| 0 | 0 | 1 | 0 | 0 | 20¹⁄₄" 40³⁄₄" | |
| 2 | 1 | 0 | 0 | 0 | 21³⁄₄" 43¹⁄₂" | |
| 0 | 0 | 0 | 1 | 0 | 26¹⁄₄" 51¹⁄₄" | |
| 0 | 1 | 1 | 0 | 0 | 28¹⁄₂" 55¹⁄₄" | |
| 1 | 0 | 0 | 1 | 0 | 31¹⁄₂" 60¹⁄₄” | |
| 0 | 1 | 0 | 1 | 0 | 34¹⁄₂" 65¹⁄₂" | |
| 0 | 0 | 2 | 0 | 0 | 37¹⁄₂" 70³⁄₄" | |
| 1 | 1 | 0 | 1 | 1 | 41¹⁄₂" 77³⁄₄" | |
| 0 | 0 | 1 | 1 | 1 | 45" 83³⁄₄" | |
| 0 | 1 | 2 | 0 | 1 | 47¹⁄₄" 87¹⁄₂" | |
| 0 | 0 | 0 | 2 | 1 | 51" | 94" |
| 0 | 1 | 1 | 1 | 1 | 53¹⁄₄" | 98" |
| 0 | 0 | 3 | 0 | 1 | 56¹⁄₄" | 103¹⁄₄" |
Illustration Key
The following safety rules apply to offset installations (letters correspond with illustration above):
A. Height of the chimney is measured from the hearth to the chimney exit.
| 424WBST |
Maximum: | 90'0" |
Minimum: |
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Without Elbows | 15'6" |
With 2 Elbows* | 17'6" |
With 4 Elbows* | 21' 0" |
B. Do not use more than 4 elbows per chimney.
Attach the straps of the return (top) elbow to a structural framing member.
The offset (first) elbow of any pair does not have straps.
C. The chimney cannot be more than 30° (45° in Canada) from the vertical plane in any installation*.
D. The maximum length of the angled run of the total chimney system is 20 feet. (G plus H cannot exceed 20 feet.)
E. A chimney support (Models TCS8A) is required every 6 feet of angled run of chimney. Chimney supports are required for every 30 feet and 60 feet of vertical chimney height above the hearth.
Determine the offset distance of your chimney arrangement from the centerline of the fireplace to the centerline of the chimney where it is to pass through the first ceiling.
Note: This offset distance may not be your full offset distance. See Examples 2 and 3.
0 | 1 | 0 | 2 | 1 | 59¹⁄₄" 108¹⁄₂" | |
0 | 0 | 2 | 1 | 1 | 62¹⁄₄" 113¹⁄₂" | |
0 | 1 | 3 | 0 | 1 | 64¹⁄₂" 117¹⁄₂" | |
0 | 0 | 1 | 2 | 1 | 68¹⁄₄" | 124" |
0 | 1 | 2 | 1 | 1 | 70¹⁄₂" | 128" |
0 | 0 | 0 | 3 | 1 | 74¹⁄₄" 134¹⁄₂" | |
0 | 1 | 1 | 2 | 2 | 78" 140³⁄₄" | |
0 | 0 | 3 | 1 | 2 | 81" | 146" |
0 | 1 | 0 | 3 | 2 | 84" 151¹⁄₄" | |
0 | 0 | 2 | 2 | 2 | 87" 156¹⁄₂" | |
0 | 1 | 3 | 1 | 2 | 89¹⁄₄" 160¹⁄₄" | |
0 | 0 | 1 | 3 | 2 | 93" 166³⁄₄" | |
0 | 1 | 2 | 2 | 2 | 95¹⁄₄" 170³⁄₄" | |
0 | 0 | 0 | 4 | 2 | 99¹⁄₄" 177³⁄₄" | |
0 | 1 | 1 | 3 | 2 | 101¹⁄₄" 181³⁄₄" | |
0 | 0 | 3 | 2 | 2 | 104¹⁄₄" 186¹⁄₄" | |
0 | 1 | 0 | 4 | 2 | 107¹⁄₄" 191¹⁄₂" | |
0 | 0 | 2 | 3 | 2 | 110¹⁄₄" 196³⁄₄" | |
0 | 1 | 3 | 2 | 3 | 114" 203¹⁄₄" | |
0 | 0 | 1 | 4 | 3 | 117³⁄₄" 209³⁄₄" | |
0 | 1 | 2 | 3 | 3 | 120" | 213¹⁄₂" |
* In Canada, two (2) SK845 are allowed.
Fig. 5 Chimney system requirements.
0 0 0 5 3 123³⁄₄" | 220" |
87D1506
