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Fan Manufacturing 2

Fan Manufacturing
Fans are generally noisy, except for low speed fan units. Noise can be distracting, uncomfortable and/or damaging to the ear. Fan noise can be a problem for both on-site and outside neighbors. Most fan manufacturers publish audio ratings for their products, and these levels should be considered when choosing a fan.
What Affects Fan Performance?
The common components of most fans that affect performance are listed below:
Bearings: Fan shaft bearings are often the biggest source of problems. Over-tightened or excessively loose fan belts, fan vibration, uneven loading on fan blades, high ambient operating temperatures, and improper (over or under) lubrication will shorten bearing life.
Belts (V-belts): Improper belt tension can affect fan performance. Audible belt squeaking during start-up is a sign of insufficient belt tension. As a general rule, belt tension should be tight enough so that the center of the opening moves one inch (1" or 2.5 cm) when middle finger pressure is applied.
Blades and Housing: A buildup of solids (dust, smoke, particulate matter) on the fan blades or housing causes instability, vibration, and loss of capacity (low airflow).
Connectors and isolation foundations: Flexible connectors and isolation foundations are used to isolate fan vibrations from the building and the rest of the ventilation system. Flexible connectors connect the ventilation system duct to the fan while eliminating fan vibration that can pass through the ventilation system duct. If they are torn or worn, fan performance will be affected.
Louvers and dampers: Some fans have inlet or outlet louvers or dampers to adjust the airflow. They can be controlled manually, pneumatically or electronically. If the louver connection connections are not tight and secure, it may affect the fan performance.
Motors: The motor operating voltage should be kept within 10% of the recommended voltage to ensure proper fan performance. Most engines are permanently lubricated for life and require no further maintenance.
What should I know about inspection and maintenance of fans?
Fans can be "out of balance" due to material buildup or wear on the fan blades. Unbalanced fans vibrate and may damage various parts of the fan (blades, body, motor, etc.). It is important to keep the fans clean and properly balanced, especially if the discharged air contains abrasive, sticky or wet materials. Planned maintenance should check for items including.

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