Hey all, my name is Mike and I'm new here, but, been in the trade for about 11 years now. Been surfing the site for a while and could really use some input at this point. I'm currently running an apartment job and have 102 of these installed right now. I have run into a problem about 60 units in. I'm starting to see failed fan motors. My guess is along the lines of dirty power source. I have ran them with an amp robe and noticed on the ones that are operating fine are at 1.3 amps and one fan that is still running is ramping up and slowing down starts at .6-.8 amps and then will increase and decrease as the line voltage fluctuates ~1-2 volts. These are brushless DC motors and the supply voltage is 208. Have any of you seen this before? Are the DC brushless motors that sensitive to where a ~1-2 volt change will cause the windings to overheat and fail? If so, what options do I have to render this issue? Technically speaking, it is not in my contract to deal with the source power, but, suggestions for the electrician would be great. I guess I should mention, the failures are not on the whole job it is the middle of the building that is 3 stories and 34 units long. I have not any call backs on the first 30 apts in the building. Thanks for your guys' input.