FULTON Caliber - Sizing Air Intake and Exhaust Piping

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SECTION 2 CAL-IOM-2012-1220 INSTALLATION
2-17
5. Stainless steel or galvanized steel pipe is recommended
for all condensate drain piping. Copper and CPVC are
acceptable for common headers only. Be aware that
condensate drain piping can be as hot as the exhaust
stack on the boiler, and precautions should be taken to
ensure this pipe would not cause burns or other injuries
to personnel that may be in the boiler room.
6. Ensure that the condensate drain piping will not be
exposed to temperatures where water/condensate will
freeze in the lines.
FIGURE 6  COMBUSTIBLE WALL PENETRATION DETAILS
¡ Sizing Air Intake and Exhaust Piping
} CATEGORY IV INSTALLATIONS, INDIVIDUAL PIPING FOR EACH
BOILER:
The minimum  ue stack length is 5 feet and the combined
pressure drop of the air intake and exhaust piping should
not exceed 1.0”wc. This is typically the equivalent of 70 ft and
8 elbows (combining the distances between the intake and
exhaust pipes). If a negative pressure is present in the stack
during some operating conditions, it should never be below
-0.04”wc.