The control system element 3 further comprising a timer element for adjusting at least one of said adjustable speed and airflow parameters of {TAIL ~ said motor} after a preprogrammed period of {HEAD ~ time} 
The control system element 3 further comprising a timer element for adjusting at least one of said adjustable speed and airflow parameters of { TAIL ~ said motor } after a preprogrammed period of { HEAD ~ time }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD