Type PEDC Direct Drive Hooded Power Roof Ventilator
APPLICATIONS: American CoolAir Type PEDC ventilators are designed to be economical low maintenance direct drive units providing maximum efficiency, ease of damper installation and a uniform appearance for both exhaust and supply roof ventilators. There are no bearings or belts to require maintenance. The fan unit is elevated above the roof curb, eliminating the possible damper clearance problem, and the backdraft damper should be mounted in the standard roof curb. The unit can also be specified less the fan component for use as a gravity ventilator.
CONSTRUCTION:Type PEDC PRVs incorporate Style C (belt drive) fan components for models in the 24 inch to 60 inch sizes. The PEDC ventilators are constructed for down-blast discharge. The air velocity opens the damper blades and escapes through the bird/insect screen, or filter section of the hood. Fan could be reversed for use as air supply ventilator. When the fan is off, counterbalanced damper blades shut by gravity to a weather-resistant closure. The motor is above the roof curb. The ventilators utilize cast aluminum adjustable pitch blade assembly with cast aluminum hub mounted directly on the motor shaft. Motor bearings are prelubricated, or supplied with external grease fittings for easy lubrication. All ventilators have removable side panel for easy access to the shaft-bearing-blade-motor components.
MATERIALS: The PEDC assembly and curb cap are fabricated of heavy gauge steel. Dampers are constructed of aluminum. The roof curb is made of galvanized steel with fiberglass insulation. Painted parts are coated after the American Coolair five-stage pretreatment system prior to the application of the thermosetting epoxy powder paint with an average thickness of 3 mils, baked at 400°F for smooth and durable finish.
DIRECT DRIVE: Direct Drive models use standardly available national brand motors with world wide service.
MOTORS:The American Coolair air-over-motor design provides extra capacity and economy because it serves to dissipate heat and thus increase horsepower capability. Totally enclosed motors are standard. Several alternatives, such as explosion proof motors, two speed, energy efficient motors and severe duty motors, are available. Only nationally recognized brand motors with nationwide service facilities are used.
WIRING: Type PEDC 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 Types PE vntilators are listed under UL705 – E39944 by Underwriters Laboratory, Inc. to U.S. and Canadian safety standards. All products are certified and licensed by AMCA (Air Movement and Control Association International, Inc.), for both air and sound performance, as well as octave band sound power levels.