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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 21: VENTING
A
E
Unvented
Radiant Tubes
Vented
Model
CTH2-40
Vent
CTH2-60
Pipes
CTH2-80
CTH2-100
CTH2-125
F
CTH2-150
CTH2-175
(inches)
A
E
F
14
18
18
14
18
18
20
24
18
20
24
18
20
24
18
20
30
18
20
30
18
SECTION 6: C
C
LEARANCES TO
OMBUSTIBLES
(centimeters)
A
E
F
36
46
46
36
46
46
51
61
46
51
61
46
51
61
46
51
77
46
51
77
46
17 of 21
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