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If using the 'Pant-Leg' duct, a mini vent hood (Fig. 8), positioned about 18" above the flue exit at the rear
of the dishwasher and connected to existing duct work, must be used for the flue gases. The volume
of flue exhaust in the mini vent hood should not exceed 200 CFM.
Fig. 8
In either case, if a powered means of exhaust is used, an electrical interlock must be provided to allow
the flow of gas to the dishwasher burner only when the exhaust system is in operation.
For additional information, refer to the National Fuel Gas Code, ANSI Z223.1, NFPA 54.
In all cases, local codes will prevail.