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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 fl ue collar and is not
intended to have the fl ue 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 fl ue gases from the gas tank heat. The volume of
fl ue exhaust required for venting moist air and fl ue 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 fl ow 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.
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 fl ow 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 specifi cations: 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/m
2
); the hood must be secured in place by noncombustible supports and must meet the RATE
OF EXHAUST FLOW CALCULATIONS on the next page.
Fig. 1
6" MINIMUM OVERHANG
ON ALL SIDES
EXHAUST DUCT SHOULD
BE CENTERED IN HOOD
1' TO 4'
CLEARANCE
18" MINIMUM OVERHANG
AT FRONT OPENING
UW50 Untensil Washer 208-240/60/3 Page 19 of 112