Unplug the unit from the wall for safety.
Remove the two screws in the upper hand grip recess (upper back of the unit). The two screws must be completely removed (not just loose and setting in the holes).
Once the two screws are out, the back half of the fan cover can be slid downward (some amount of force is needed to unsnap the two halves from each other but be careful since the parts are all plastic and can possibly snap).
Once the back is unsnapped from the front, you can lift the back half away from the front half and the inside parts are now accessible.
I have found on my fan that it is the top fan shaft / bushing that is causing the squeaking noise that so many have complained about. I have found that periodically lubricating the top shaft/bushing will make the fan sound like new again - for a while. Every 2 - 3 weeks I need to clean (wipe off old lube) and re-apply fresh lube).
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You may need to UNSCREW the front half of you fan guard plastic casing or depress it in a few place if you see notches on the cage itself. Remember the knobs you will be removing to take the blades off to clean will be threaded opposite, one will screw off and on clockwise then other counter clockwise. Be sure FAN is UNPLUGGED BEFORE YOU open it up. Lay all parts in bathtub, Spray with Cleaning foam, pour lots of water over to clean all sides, then let drain and dry in bathtub. Less muss and fess this way!
The fan guard will split into two pieces... At the center or the large diameter of the guard there are small tabs on the inside that hold the two pieces together. To reach them and release them you will need a small long screw driver or other pointy object. Carefully one by one release the tabs to split the front part of the guard off.
If it is making a loud humming sound it is probably getting weak and will have to be replaced. Is it doing it in all speeds? Motor replacement would probably not be worthwhile unless it is a very expensive unit. I'd opt to replace the unit.
cleaning the tower fan consists of this, i took the time to figure it out! unscrew top two screws on back of tower fan. then on bottom of tower fan is a screw cover,(pin size hole in middle of circle) pull cover off. unscrew hidden screw, and now with a little force it should pop right off. it exposes the filter and all it interior. front screen does not come off. oh yeah,your welcome!