SO HERE IS MY SITUATION. THE fan arrived with the on off speed knob not on the shaft.  It will not go on.  The shaft is cheap plastic so the knob won't stay on.  I bought it from thenerds dot net and they want me to pay return shipping which would cost from $[...]to $[...] depending who ships it because of the large box.  I am waiting to hear from them before I dispute the bill with the credit card company and file with the attorney General for fraud.  Lesson learned is buy from AMAZON!!! At least they have a return policy you can live with.  I know better now.  The fan is too noisy on high speed.  i have had the fan on for 2 hours.  it is about 60 outside and yet the room has gone down from 80 to 78 in 2 hours.  When I stand a foot away from the fan the room is as hot as it was before I had the fan on.  When I stand in front of the fan it is cool.  Maybe it is sucking air in the room but it is not helping cool the room.  On top of the crappy performance I have to deal with the low quality of a broken knob and also a rather worthless template to install the brackets.  I should have listened to my gut feeling and bought a $[...] box fan and made a bracket to hold it in the window frame so i could easily remove it.  Right now I will need to take this 16 poudn fan off the bracket screws to close the window.  so with shipping the nerds dot com ripped me blind.  I am glad I didn't pay more for it but I might be stuck with it.  I wrote to Lasko about this and will see if they can replace it for me or get me a new shaft or knob.  MY ADVICE DO NOT BUY THIS FAN.  CHEAP JUNK.  I DON'T CARE IF 8 people liked it here- this is cheap junk