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SBN71-120 thru 85-390, SBD30-150/199 TANK TYPE COMMERCIAL
GAS WATER HEATER SERVICE HANDBOOK
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All SBN and SBD water heaters are classified by ANSI as Category I (non-condensing,
negative pressure venting) appliances. They are approved for type B vent. The draft inducer
does not pressurize the exhaust.
VENTING
VENTING – MULTIPLE CATEGORY I GAS WATER HEATERS