In our investigation and experience we found that many general problems of wall fan motor such as 
 

• Shorter motor life

• Inconvenience for servicing

• Durability of part

were caused by the following factor:
 

• High motor temperature rise

• Big voltage fluctuation

• Type of bearing used improper

By gathering more information and feedback from consumers and further follow-up analysis it has proven that in areas when heavy duty performance is required (e.g. wall fan),  we must use ball bearing motor.