SECTION 12: V
ENTING
- U
NITARY
H
EATER
57 of 91
12.10 Common Vertical Venting
Req
u
irements:
• Maxim
u
m of 4 heaters can be commonly vented
thro
u
gh the roof.
• Heaters m
u
st be of the same BTU o
u
tp
u
t.
• Heaters m
u
st be controlled by a common
thermostat.
• Connections to a common stack m
u
st be
positioned to avoid direct opposition bet
w
een
streams of comb
u
stion gases.
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