SECTION 6: C
LEARANCES
TO
C
OMBUSTIBLES
17 of 21
NOTE:
1. All dimensions are from the s
u
rfaces of all t
u
bes, co
u
plings and elbo
w
s.
2. Clearances B, C and D can be red
u
ced by 50% after 25' (7.5 m) of t
u
bing do
w
nstream
from
w
here the b
u
rner and b
u
rner t
u
be connect.
FIGURE 21: VENTING
(inches)
(centimeters)
Model
A
E
F
A
E
F
CTH2-40
14
18
18
36
46
46
CTH2-60
14
18
18
36
46
46
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
T
ubes
V
ent
Pipes
Unvented
Vented
A
E
F
