Honeywell fans

If you look on the back of the fan, there are a series of small holes going round the perimeter of the case, just outside where the grill finishes. Using a philips-head screwdriver, unscrew the screws located here. Pull off the front of the fan and clean. Reverse the process to put the case back on, making sure that all the spacers are in the correct place.

There are actually *NOT* 6 phillips screws. There are 4 in an "X" fashion (at 2, 4, 6, and 12 o clock). The last two at 12 and 6 are HEX heads.
The space is *VERY* tight, so you may want to choose a small screwdriver of the correct type, lest you strip the screw completely (like I've just done) and find yourself with a fan-sized hole in your wall.

Also, it may have just been my fan, but if the phillips screws don't come out all the way (like just a little), take a flathead and push *up* from the bottom while you unscrew it. Or you could get lucky and knock them out with a few, well-placed palm strikes.