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CTH2-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL
8
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.
*When installed in the first 10' (3 m).
FIGURE 10: 2-FOOT DECO GRILLE AND PROTECTIVE GRILLE
(inches) (centimeters)
Model ABCDABCD
CTH2-40 6 27 53 27 16 69 135 69
CTH2-60 6 35 63 35 16 89 161 89
CTH2-80 6 38 66 38 16 97 168 97
CTH2-100 6 40 71 40 16 102 181 102
CTH2-125 6 46 77 46 16 117 196 117
CTH2-150 6 50 80 50 16 127 204 127
CTH2-175 8 52 82 52 21 133 209 133
A
C
D
B
FIGURE 11: LOWER CLEARANCE SHIELD*
(inches) (centimeters)
Model ABCDABCD
CTH2-40 6 34 27 34 16 87 69 87
CTH2-60 6 39 33 39 16 100 84 100
CTH2-80 6 40 38 40 16 102 97 102
CTH2-100 6 50 44 50 16 127 112 127
CTH2-125 6 54 48 54 16 138 122 138
CTH2-150 6 55 50 55 16 140 127 140
CTH2-175
- UNAPPROVED - - UNAPPROVED -
A
C
D
B
FIGURE 12: VENTING
(inches) (centimeters)
Model A E F A E F
CTH2-40 14 18 18 36 46 46
CTH2-60141818364646
CTH2-80 20 24 18 51 61 46
CTH2-100 20 24 18 51 61 46
CTH2-125 20 24 18 51 61 46
CTH2-150 20 30 18 51 77 46
CTH2-175 20 30 18 51 77 46
Radiant Tubes
Vent
Pipes
Unvented
Vented
A
E
F