The modular timer for an air circulator comprises a timer for energizing an air circulator motor for a predetermined amount of time. A first connector connects the timer to an air circulator motor while a second connector connects the timer to a power switch. A selection switch controls the timer setting...http://www.google.co.uk/patents/US6572338?utm_source=gb-gplus-sharePatent US6572338 - Modular air circulator control
