I don't have the link but on my fan there are only 2 small screws on the rear cover. I just sprayed WD-40 on the motor front and back. I made sure not to spray the huge copper coil.
If I change my lights I'm seriously considering a 250w digital. My new exhaust fan should be able to handle that heat load and the light output in flower should give me some nice trees to work with in that space. I was looking at 150w but I want to use a MH bulb once I make the switch and 150w seems like a lateral move when I compare it to my current setup. I'd rather not be swapping from my CFL fixture to a HPS fixture during the grow as well, I like simple.