I was called out to your business for an electrical issue. You explained to me that the wall mounted exhaust fans are not working properly. After reviewing the pictures you sent me, I suggest that we preform a diagnostic / troubleshooting evaluation to see if the fans need a minor or major repair. We will determine if the issue is electrical, the belt / drive system or the motor itself. Thank you for choosing Kings Electric and Air Conditioning for your service needs! We hope to hear from you soon so we can get started right away! Your technician, John G.