Heat + light + exhaust are all on a single power connection. Those three functions are via a remote control. A substantial squirrel cage blower starts up for the heater, exhaust and ventilate functions while a silent stepper motor moves baffles to steer the air appropriately. If the unit is fed from a light switch, the default behavior is light on which is convenient so you don't have to touch the remote if you only want light. There are 4 preset settings for brightness/color temperature that you can cycle through by pressing the top left button or rapidly toggling the power. After a staying a minute on a particular light setting, that becomes the default power up light setting when power is applied. The remote needs to be chained to the wall or something because the heat and exhaust absolutely require the remote. On heat, the warm air blows down from the narrow grill. The fan speeds, the light intensity and color temp are adjustable from the remote, but the heat seems on or off only. I wanted to allow people to be able to say \"Alexa, Heater on and skip the remote but the he remote control is a rolling code RF type so Alexa control via an IR interface was impossible. One warning on install: The tiny LED housing for the light has a connector inside that can be easily unplugged if the front grill is allowed to hang from the cable while you are installing the unit. If the light doesnt light for you, just snap the cover off the flat LED housing and reconnect the cable.
Robert f. 
Jordan 
Jeremy Johnson 
