VENTING REQUIRED WITH GAS HEAT (OPTIONAL WITH STEAM OR ELECTRIC HEAT)

The Hobart UW50 Utensil Washer, equipped for gas tank heat, is not provided with a flue collar and is not intended to have the flue directly connected to a ventilation system. However, the products of combustion must be vented to the outside air. A vent hood over the entire utensil washer (Fig. 1) can be employed to vent both the moist air from the wash chamber and the flue gases from the gas tank heat. The volume of flue exhaust required for venting moist air and flue gases using a single vent hood over the entire utensil washer must be calculated using the formulas on the next page.

If a powered means of exhaust is used, an electrical interlock must be provided to allow the flow of gas to the utensil washer burner only when the exhaust system is in operation.

For additional information, refer to the National Fuel Gas Code, ANSI Z223.1, NFPA 54 (latest editions). In all cases, local codes will prevail.

EXHAUST DUCT SHOULD

BE CENTERED IN HOOD

6" MINIMUM OVERHANG

ON ALL SIDES

1' TO 4'

CLEARANCE

18" MINIMUM OVERHANG AT FRONT OPENING

Fig. 1

Type I or Type II canopy hoods are recommended. A factory-built commercial exhaust hood may be listed as conforming to Underwriters Laboratory's standard 710, titled Exhaust Hoods for Commercial Cooking Equipment. Hoods must be installed according to the manufacturer's instructions. Make-up air must be provided so that the exhaust flow rate results in a positive building pressure in the room where the unit is located (more outside air than exhaust air). Factory-built hoods not tested to UL standard 710 and custom-built hoods must comply with the following specifications: Stainless steel should have a minimum thickness of 0.037 in. (0.94 mm) [No. 20 Gauge] or copper sheet weighing at least 24 ounces per square foot (7 Kg/m2); the hood must be secured in place by noncombustible supports and must meet the RATE OF EXHAUST FLOW CALCULATIONS on the next page.

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