I open the slider and put the fan in the opening. Close the window to squeeze the fan and flip down the latch. It holds nice and tight. The power is off the
light in the cabinet. I split apart an old RCA "Y" adapter and popped one chunk out of the bottom of the cabinet and the other attached to the fan. No switch... I just plug it in. Dorothy pointed out that we shouldn't put the screen on... grease buildup.