SECTION 3: CLEARANCES TO COMBUSTIBLES
NOTE: 1. All dimensions are from the surfaces of all tubes, couplings and elbows.
2.Clearances B, C and D can be reduced by 50% after 25' (7.5 m) of tubing downstream from where the burner and burner tube connect.
FIGURE 7: U-TUBE, STANDARD REFLECTOR
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| Model | A | B | C | D | A | B | C | D |
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| 6 | 38 | 69 | 37 | 16 | 97 | 176 | 94 | |
B | C | D | 6 | 46 | 79 | 43 | 16 | 117 | 201 | 110 | |
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6 | 50 | 84 | 47 | 16 | 127 | 214 | 120 | |
8 | 54 | 87 | 51 | 21 | 138 | 221 | 130 |
FIGURE 8: U-TUBE, 45°
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| Model | A | B | C | D | A | B | C | D | |||
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| 8 | 8 | 66 | 46 | 21 | 21 | 168 | 117 | |||||||||||
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| 8 | 8 | 78 | 61 | 21 | 21 | 199 | 155 | ||
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| 8 | 8 | 84 | 66 | 21 | 21 | 214 | 168 | |
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| 8 | 8 | 85 | 70 | 21 | 21 | 216 | 178 | |||
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FIGURE 9: U-TUBE, OPPOSITE 45° REFLECTOR
(inches) | (centimeters) |
| A |
| Model | A | B | C | D | A | B | C | D |
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| 8 | 60 | 66 | 22 | 21 | 153 | 168 | 56 | |
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| D | 10 | 70 | 78 | 22 | 26 | 178 | 199 | 56 | |
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| 12 | 74 | 84 | 22 | 31 | 188 | 214 | 56 | ||
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12 | 76 | 85 | 22 | 31 | 194 | 216 | 56 |
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