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CTHN-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL
6
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 8: 2-FOOT DECO GRILLE, 1-FOOT DECO GRILLE AND PROTECTIVE GRILLE
(inches) (centimeters)
Model ABCDABCD
CTHN-40 5 20 41 20 13 51 104 51
CTHN-60 5 27 51 27 13 69 130 69
CTHN-80 5 30 58 30 13 76 147 76
CTHN-100 5 32 60 32 13 81 152 81
CTHN-125 5 35 65 35 13 89 165 89
CTHN-150 5 39 71 39 13 99 180 99
CTHN-175 8 44 74 44 20 112 188 112
CTHN-200 8 47 76 47 20 119 193 119
A
C
D
B
FIGURE 9: LOWER CLEARANCE SHIELD*
(inches) (centimeters)
Model ABCDABCD
CTHN-40 5 25 22 25 13 64 56 64
CTHN-60 5 30 27 30 13 76 69 76
CTHN-80 5 37 37 37 13 94 94 94
CTHN-100 5 39393913999999
CTHN-125 5 41 41 41 13 104 104 104
CTHN-150 5 43 50 43 13 109 127 109
CTHN-175
- UNAPPROVED - - UNAPPROVED -
CTHN-200
- UNAPPROVED - - UNAPPROVED -
A
C
D
B
FIGURE 10: VENTING
(inches) (centimeters)
Model A E F A E F
CTHN-40 14 18 18 36 46 46
CTHN-60 14 18 18 36 46 46
CTHN-80 20 24 18 51 61 46
CTHN-100 20 24 18 51 61 46
CTHN-125 20 24 18 51 61 46
CTHN-150 20 30 18 51 76 46
CTHN-175 20 30 18 51 76 46
CTHN-200 20 30 18 51 76 46
Radiant Tubes
Vent
Pipes
Unvented
Vented
A
E
F