A2
C2
A1
C1
A2
C2
B2
A1
B1
C1
B2
B1
FTF13 OFFSET ELEVATION CHART
| A | B |
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| Number of FTF13 | A | B | ||||
Offset | Height | Offset/Return | Chimney Sections | Offset | Height | ||||||
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(Inches) | (Inches) | Elbow Set | Stabilizer | 12" | 18" | 36" | (mm) | (mm) | |||
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4 |
| 15 | ³⁄₄ | 1 | 0 | 0 | 0 | 0 | 102 | 400 |
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9 |
| 24 | ¹⁄₂ | 1 | 0 | 1 | 0 | 0 | 229 | 622 |
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12 |
| 29 | ³⁄₄ | 1 | 0 | 0 | 1 | 0 | 305 | 756 |
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14 | ¹⁄₄ | 33 | ¹⁄₂ | 1 | 0 | 2 | 0 | 0 | 362 | 851 |
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17 | ¹⁄₄ | 38 | ¹⁄₂ | 1 | 0 | 1 | 1 | 0 | 438 | 978 |
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20 | ¹⁄₄ | 43 | ³⁄₄ | 1 | 0 | 0 | 2 | 0 | 514 | 1111 |
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21 |
| 45 | ¹⁄₄ | 1 | 0 | 0 | 0 | 1 | 533 | 1149 |
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22 | ¹⁄₄ | 47 | ¹⁄₂ | 1 | 0 | 2 | 1 | 0 | 565 | 1207 |
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25 | ¹⁄₄ | 52 | ¹⁄₂ | 1 | 0 | 1 | 2 | 0 | 641 | 1334 |
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26 | ¹⁄₄ | 54 | ¹⁄₄ | 1 | 0 | 1 | 0 | 1 | 667 | 1378 |
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28 | ¹⁄₄ | 57 | ³⁄₄ | 1 | 0 | 0 | 3 | 0 | 718 | 1467 |
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29 | ¹⁄₄ | 59 | ¹⁄₄ | 1 | 0 | 0 | 1 | 1 | 743 | 1505 |
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31 | ¹⁄₄ | 63 |
| 1 | 0 | 2 | 0 | 1 | 794 | 1600 |
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32 | ¹⁄₂ | 65 |
| 1 | 0 | 4 | 1 | 0 | 826 | 1651 |
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34 | ¹⁄₄ | 68 | ¹⁄₄ | 1 | 0 | 1 | 1 | 1 | 870 | 1734 |
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36 | ¹⁄₄ | 71 | ³⁄₄ | 1 | 0 | 3 | 0 | 1 | 921 | 1822 |
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37 | ¹⁄₄ | 73 | ¹⁄₄ | 1 | 0 | 0 | 2 | 1 | 946 | 1861 |
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38 | ¹⁄₄ | 75 |
| 1 | 0 | 0 | 0 | 2 | 972 | 1905 |
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39 | ¹⁄₄ | 77 |
| 1 | 0 | 2 | 1 | 1 | 997 | 1956 |
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41 | ¹⁄₂ | 80 | ¹⁄₂ | 1 | 0 | 1 | 4 | 0 | 1054 | 2045 |
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43 | ¹⁄₄ | 83 | ³⁄₄ | 1 | 0 | 1 | 0 | 2 | 1099 | 2127 |
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44 | ¹⁄₂ | 85 | ³⁄₄ | 1 | 0 | 3 | 1 | 1 | 1130 | 2178 |
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45 | ¹⁄₄ | 87 | ¹⁄₂ | 1 | 0 | 0 | 3 | 1 | 1149 | 2223 |
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46 | ¹⁄₄ | 89 |
| 1 | 0 | 0 | 1 | 2 | 1175 | 2261 |
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48 | ¹⁄₄ | 91 | ¹⁄₂ | 1 | 0 | 2 | 0 | 2 | 1226 | 2324 |
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49 | ¹⁄₂ | 94 | ¹⁄₂ | 1 | 0 | 1 | 5 | 0 | 1257 | 2400 |
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51 | ¹⁄₄ | 97 | ³⁄₄ | 1 | 0 | 1 | 1 | 2 | 1302 | 2483 |
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54 | ¹⁄₄ | 103 |
| 1 | 0 | 0 | 2 | 2 | 1378 | 2616 |
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55 | ¹⁄₄ | 104 | ¹⁄₂ | 1 | 0 | 0 | 0 | 3 | 1403 | 2654 |
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56 | ¹⁄₂ | 106 | ¹⁄₂ | 1 | 0 | 2 | 1 | 2 | 1435 | 2705 |
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59 | ¹⁄₂ | 111 | ³⁄₄ | 1 | 0 | 1 | 2 | 2 | 1511 | 2838 |
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61 | ³⁄₄ | 116 |
| 1 | 1 | 1 | 0 | 3 | 1568 | 2946 |
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64 | ³⁄₄ | 121 | ¹⁄₄ | 1 | 1 | 0 | 1 | 3 | 1645 | 3080 |
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67 |
| 124 | ³⁄₄ | 1 | 1 | 2 | 0 | 3 | 1702 | 3169 |
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69 |
| 127 | ³⁄₄ | 1 | 1 | 1 | 3 | 2 | 1753 | 3245 |
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70 |
| 130 |
| 1 | 1 | 1 | 1 | 3 | 1778 | 3302 |
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Figure 36
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| Joints | |
Chimney |
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| 4' | Required | At | 6' | |
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| Past | |||||
Section |
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| Screws | Joint |
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| Offset | Every |
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| Required 6' | In | of |
| No. 8 x 1/2" SMS | ||||
| 6' |
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| First |
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| Screws | For |
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No | Joints |
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Figure 37
73 |
| 135 | ¹⁄₄ | 1 | 1 | 0 | 2 | 3 | 1854 | 3435 |
75 |
| 138 | ³⁄₄ | 1 | 1 | 2 | 1 | 3 | 1905 | 3524 |
79 |
| 145 | ¹⁄₂ | 1 | 1 | 1 | 0 | 4 | 2007 | 3696 |
80 | ¹⁄₄ | 147 | ¹⁄₂ | 1 | 1 | 3 | 1 | 3 | 2038 | 3747 |
82 |
| 150 | ³⁄₄ | 1 | 1 | 0 | 1 | 4 | 2083 | 3829 |
87 |
| 159 | ¹⁄₂ | 1 | 1 | 1 | 1 | 4 | 2210 | 4051 |
INSTALLING OFFSETS
First, review the Offset Elevation Chart and see Figure 39 for reference.
Step 1. Determine the offset distance where chimney is to pass through the first ceiling- dimension “A.” To find this point on your ceil- ing, first determine the center point for a verti- cal chimney following the instructions for ver- tical installation.
Measure height to the ceiling from the top of
Step 2. Proceed by using the Straight Up Instal- lation Instructions for cutting and framing ceil- ing and roof openings.
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
13
