Type 2 Environmental Protection

Type 2 environmental protection is a thicker silicone coating that is also applied to the motor assembly. For this option, the motor winding and lamination stack is coated with type 1 material. The motor winding and lamination stack has very tight tolerances between the rotating rotor and need only a thin coating. The populated circuit board is dipped into the thicker silicone material; which creates a thicker barrier, especially over sharp edges such as solder points. Each motor assembly is thoroughly cleaned in a solvent bath to remove any oils or impurities before any material is applied. After the material has dried, the process is repeated to form a good thick coat. Cure time is about 30 minutes, per coat. After the motor assembly has been cured from the second coating, the motor assembly can then be returned to the assembly line for final production. The material is also non-corrosive, fungus resistant, and has a viable temperature range exceeding the range of the fans. Because of the thick coat and the elastomer properties of silicone, this option also increase the fans ability to resist excessive vibration and shock.

Type 2 environmental protection is designed to meet the harsh environmental conditions. These conditions include the direct or indirect spray of water onto the fan, exposure to fine dust particles, morning dew that may condensate inside the fan, long term exposure to salt spray and salt fog. In general, this option is designed to meet standard specifications such as:

Details of these specifications and their relevant requirements are available upon request.

Type 3 Environmental Protection

Type 3 environmental protection is a silicone material that is used to either pot the PC board into the venturi of the fan or completely encapsulate the motor assembly with the silicone material. For fans that are only potted, the motor windings and lamination stack and coated with the Type 1 material. The motor winding and lamination stack has very tight tolerances between the rotating blade and need only a thin coating. For fans that are completely encapsulated, the motor assembly is placed into a mold; which has been cleaned, sprayed with a release agent, and heated in an oven. The material is then poured into the mold/motor assembly to a preset amount. After the material has been poured into the mold/motor assembly, the mold is vibrated to work out any air bubbles that may be trapped. The cure time between pouring the material and removing the encapsulated motor assembly from the mold is approximately 20 minutes. After the encapsulated motor assembly is removed, it is 100% inspected for conformity and returned to the assembly line for final production. The material is also non-corrosive, fungus-resistant, and has a viable temperature range exceeding the range of the fans. Because of the elastomer properties of silicone, this option also increases the fans ability to resist excessive vibration and shock.

Type 3 environmental protection is designed to meet the harshest environmental conditions. These conditions include the direct or indirect spray of water onto the fan, exposure to fine dust particles, morning dew that may condensate inside the fan, long term exposure to salt spray and salt fog. In general, this option is designed to meet standard specifications such as:

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