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SECTION 3: CLEARANCES TO COMBUSTIBLES
7 of 71
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
(inches) (centimeters)
Model ABCDABCD
CTH3-80 6 38 69 37 16 97 176 94
CTH3-115 6 46 79 43 16 117 201 110
CTH3-150 6 50 84 47 16 127 214 120
CTH3-200 8 54875121138221130
A
C
D
B
FIGURE 8: U-TUBE, 45°
(inches) (centimeters)
Model ABCDABCD
CTH3-80 8 8 66 46 21 21 168 117
CTH3-115 8 8 78 61 21 21 199 155
CTH3-150 8 8 84 66 21 21 214 168
CTH3-200 8 8 85 70 21 21 216 178
B
C
D
A
FIGURE 9: U-TUBE, OPPOSITE 45° REFLECTOR
(inches) (centimeters)
Model ABCDABCD
CTH3-80 8 60 66 22 21 153 168 56
CTH3-115 10 70 78 22 26 178 199 56
CTH3-150 12 74 84 22 31 188 214 56
CTH3-200 12 76 85 22 31 194 216 56
A
C
D
B