User adjustable rate
It appears that the "User adjustable rate" for the one that occurs continuously whenever the master switch is on unless one does manual override via a switch or if the humidity sensor is on and humidity level is above the set level.
Also, I assume the toggle mode is to allow one to trigger a timed full speed mode without the need for a third switch which triggers a non-timed full "certified rate" airflow so one can temporarily increase the flow rate for the period as set by the delay time setting.
9 months ago
Snohomish, WA, USA