BH-S
ERIES
I
NSTALLATION
, O
PERATION
AND
S
ERVICE
M
ANUAL
38 of 59
8
.10 Common Vertical Ventin
g
Req
u
irements:
• Maxim
u
m of fo
u
r heaters can
b
e commonly
v
ented thro
u
gh the roof.
• Heaters m
u
st
b
e of the same BTU o
u
tp
u
t.
• Heaters m
u
st
b
e controlled
b
y a common
thermostat.
• Connections to a common stack m
u
st
b
e
positioned to a
v
oid direct opposition
b
et
w
een
streams of com
bu
stion gases.
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