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Proco Products, Inc.
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Proco - Model Style 520 -U-Type Non-Metallic Flexible Fan Connector

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The Proco Style 520 Ducting Flexible Connector is an economical, integrally flanged design, used primarily for the reduction of fan vibration. The fan/duct connector features a U-shaped design configuration, with a minimum of one to two plies of reinforced fabric that has been vulcanized into a homogeneous product. The finished thickness can be selected from 3/16”, 1/4”, or 3/8”. The Style 520 is manufactured with continuous corners; no splices are made in the corner areas.

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PROCO Style 520 U-Type Fan/Duct Connectors: The most economical of the integrally flanged designs, the Style 520 is predominately used for fan vibration applications. The fan/duct connector is manufactured in a U-Design configuration with a minimum of one(1) to two (2) plies of reinforced fabric vulcanized into a homogeneous product that is 3/16", 1/4" or 3/8" thick. The Style 520 is manufactured with continuous corners. No splices will be made in the corner areas. Listed below is information regarding the Style 520 non-metallic fan/duct connectors:

System Design Considerations: In designing the Series 500, Style 520 non-metallic fans/duct connector, several considerations must be taken into account to ensure long-lasting service.

  • System Media: The designer and/or requesting party should define the system media to determine the correct elastomer for each application. Evaluation of the gas/air composition should be made during design of the non-metallic fan/duct connector. Abrasion characteristics and external environment conditions should also be taken into ac-count when specifying the fabric element.
  • System Temperature: The system operating temperature is of primary importance to the design of a non-metallic fan/duct connector, although the system design is generally specified. It is important to distinguish between operating and design as “design” can include a significant safety factor which may result in an upgraded material or de-sign selection.
  • System Pressure: Normal operating pressures and maximum pressures (positive and negative) under upset conditions should be specified. Combinations of pressures and temperatures should be specifically identified.
  • Movements: Movements consist of thermal growth resulting from both operating and upset conditions. Individual movements resulting from both conditions should be specified. Maximum installation misalignment should also be taken into account to determine if the non-metallic fan/duct connector design is capable of reacting to a combination of the total maximum movements.