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SBN71-120 thru 85-390, SBD30-150/199 TANK TYPE COMMERCIAL
GAS WATER HEATER SERVICE HANDBOOK
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1.The vent pipe should ALWAYS be the
same size as the outlet of the draft hood or
factory supplied vent reducer.
Model SBN71-120 is supplied with a
6” to 5” reducer.
2. The diameter of a vent pipe should
NEVER be reduced, no matter what the
circumstances.
3. In some cases it may be necessary to
run a vent larger than the vent connector.
4. Take the maximum vertical rise (x)
possible immediately above the draft hood.
9 RULES FOR GOOD VENTING
VENT
CONNECTOR
VENT PIPE