Type JBC Up Blast Power Roof Ventilators
APPLICATIONS: American CoolAir JBC ventilators are designed for use in factories, warehouses, commercial buildings, machine rooms, where it is necessary for the fan assembly to be located above the roof, to discharge up in the air, and to have low profile.
CONSTRUCTION:Type JBC ventilators are constructed to discharge vertically so that air velocity seals the opening against rain and snow. When the fan is off, counterbalanced fiberglass damper doors/flaps close by gravity to a weather-resistant closure and serve as a skylight. The motor and drive components are recessed into the roof curb. The JBC PRVs incorporate an all-welded curb cap and rugged angle frame design. The steel fan shaft is supported by two pillow-block ball bearings attached to this frame. JBC PRVs have cast aluminum adjustable pitch airfoil blades that are securely attached to a heavy cast aluminum hub. Blade pitch is set for catalog performance. Most models are equipped with a variable pitch motor pulley that allows PRV speed adjustment where desirable. If pulley is opened to reduce propeller speed, air velocity may be reduced below minimum essential for all-weather usage. A speed increase may overload the motor.
MATERIALS: The JBC assembly and curb cap are fabricated of heavy gauge steel and the dampers are constructed of durable fiberglass. The wind shroud is made of galvanized steel. Painted parts are coated with a thermosetting epoxy coating rated for hardness, impact resistance, adhesion and chemical resistance. Parts requiring painting are processed through the American Coolair five-stage pretreatment system prior to the application of any coatings to ensure maximum finish adhesion. These parts use a thermosetting epoxy powder paint with an average thickness of 3 mils and baked at 400°F.
BELT DRIVE: Belt driven models use Variable Pitch Pulles which allows fan speed adjustment.
MOTORS: Type JBC feature American Coolair’s air-over-motor design, which provides extra capacity and economy as it serves to dissipate heat and thus increase horsepower capability. Totally enclosed motors are standard. Several alternatives, such as explosion-proof motors, energy efficient motors and severe duty motors, are available to fit your specific needs. Only nationally recognized brand motors with nationwide service facilities are used.
WIRING: Type JBC PRVs feature a conduit through the curb cap for convenience in connecting power supply. If a safety disconnect switch accessory is specified, it is mounted above curb cap and attached to the conduit for a rain-resistant connection and switch enclosure.
CERTIFICATION: All Type J ventilators are listed by Underwriters Laboratory, Inc. to U.S. and Canadian safety standards. Certified ratings licensed by AMCA (Air Movement and Control Association, Inc.), for both air and sound performance are available for all Type J and JTE PRVs. (UL705 – E39944)