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d
b
b l
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B l M
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Finned copper tube gas boilers & water heaters – Boiler Manual
9
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Figure 3
VENT OPTION 1: DIRECT VENT — Combination direct vent system
Vent pipe and air pipe equivalent lengths must not exceed 100 feet each. See Table 3 or 4 for min. pipe diameters.
Locate exhaust terminal
downwind
from air intake
to reduce potential for flue
gas recirculation. Failure to
comply could result in severe
personal injury or death.
Figure 4
VENT OPTION 1: DIRECT VENT — Vertical air intake and venting for direct vent system
Vent pipe and air pipe equivalent lengths must not exceed 100 feet each. See Table 3 or 4 for min. pipe diameters.
