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PRD-CA Specification


Model: PRD-CA

Description: Fans shall be Type PRD-CA, Low Profile Upblast Propeller Roof Ventilator, Direct Drive

Certifications: Model PRD-CA shall be available UL 705 listed. Fans shall bear a permanently attached nameplate displaying model and serial number of the unit for future identification. Performance ratings shall conform to AMCA Standard 211 (air performance) and 311 (sound performance). Fans shall be tested in accordance with ANSI/AMCA Standard 210 (air performance) and 300 (sound performance) in an AMCA accredited laboratory. Fans shall be licensed to bear the AMCA certified ratings seal for both sound and air.

Construction: Fan curb caps shall be constructed of heavy gauge galvanized steel or painted steel for durability and appearance. Curb caps shall have a deep formed inlet venturi for efficient airflow and pre-punched holes for easy mounting to the roof curb. Discharge cap with butterfly dampers shall contain a rain channel to protect against rain entry. Butterfly damper blades constructed of steel as standard, unless the outlet velocity of the fan is below the minimum required to open steel damper blades, then aluminum blades shall be provided. Discharge caps and motor mount assemblies shall be constructed of heavy gauge galvanized steel.

Propellers: Propellers shall be constructed of fabricated steel or cast aluminum blades and hubs. Propellers on direct drive units shall be secured to the motor shaft with a taperlock bushing. Propellers on belt driven units shall be welded to the fan shaft or secured to the fan shaft with a taperlock bushing.

Motors: All motors shall be single phase or three phase induction, permanently lubricated, heavy-duty, ballbearing type, closely matched to the fan load and provided at the voltage, phase, hertz and enclosure as provided on the fan schedule.

Finish and Coating: Fans shall have galvanized steel or finish painted curb caps, motor supports and windbands.

Accessories: When specified, accessories such as inlet safety guards, fusible link assemblies, magnetic damper latches, hinged bases, extended lube lines, roof curbs and disconnect switches shall be provided by manufacturer to maintain one source responsibility.

Factory Run Test: All fans prior to shipment shall be completely assembled and test run as a unit at operating speed or maximum RPM allowed for the particular construction type. Each propeller shall be statically and dynamically balanced in accordance with ANSI/AMCA 204-96 "Balance Quality and Vibration Levels for Fans" to Fan Application Category BV-3, Balance Quality Grade G6.3. Balance readings shall be taken by electronic type equipment in the axial, vertical, and horizontal directions. Records shall be maintained and a written copy shall be available upon request.

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