Corp. Oil Boiler Installation, Operating And Service Instructions

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c. Mount the vacuum relief valve into the tee and
fasten with a screw and nut in collar tabs. To
ensure proper operation, the gate must be level
across the pivot point and plumb. Refer to
vacuum relief valve manufacturer's instructions.
5. Install remainder of air intake, securing each joint
with at least three (3) sheet metal screws evenly
spaced.
6. Install air intake terminal. See Figure 17.
NOTICE
Intake terminal must be at least 12 inches above
grade plus snow accumulation.
7. Seal all external joints with weatherproof caulk.
WARNING
Do not locate air intake where petroleum distillates,
CFC's, detergents, volatile vapors or any other
chemicals are present. Severe boiler corrosion
and failure will result.