A
difference of 7½ times
As an example, the zero offset bearing/ load arrangement on American
Coolair CBL/CBH/CBHX wall fans has a minimum L10 life
of 300,000 hours, 7½ times that found in most offset bearing/load
arrangements. In this case the American Coolair fan would last 7½
times longer based on L10 life alone.
How drive design affects fan life
Drive design
has a direct impact on fan life. A design that uses much larger
drives or driven pulley diameters ensures longer belt life typically
twice that of designs using smaller drives or driven pulley diameters.
Also the ability to align all components precisely is affected by
the distance between bearings. The difficulty of proper alignment
increases exponentially as the distance between bearings
increases. |
To
obtain the same L10 life as you would get from an American
Coolair designed fan (such as CBL/CBH or CBHX type fans) you would
have to replace a comparable fan at least once under normal circumstances.
|
