SBN71-120 thru 85-390, SBD30-150/199 TANK TYPE COMMERCIAL
GAS WATER HEATER SERVICE HANDBOOK
t
n
e
m
tr
a
p
e
D
g
n
i
n
i
a
r
T
l
a
c
i
n
h
c
e
T
1
2
s
r
e
t
a
e
H
r
e
t
a
W
e
t
a
t
S
7
0
0
2
©
e
e
s
s
e
n
n
e
T
,
y
ti
C
d
n
a
l
h
s
A
5.
Use a 45° elbow in place of a 90° elbow where possible. Avoid the use of a 90° elbow
immediately above the draft hood. Allow the maximum vertical rise before any elbow.
6.
Horizontal pipe should be sloped
upward at a minimum of ¼” per foot.
9 RULES FOR GOOD VENTING
HORIZONTAL RUN
VERTICAL RISE
EQUAL TO
1/4” PER FOOT OF
HOROZONTAL
RUN
