How should I clean and maintain this air circulator? Is it possible to disassemble it?

Yes, the grill and blades of this fan can be disassembled. The following disassembly steps are for reference only:

1. Remove the screw on the front grille and rotate the grille counterclockwise to take it off.
2. Remove the blade cap by rotating it as shown and take the blade assembly out of the shaft.
3. Rinse the cap, blades, and grille under running water or with a clean, damp cloth.
4. Dry up all parts, and insert the blade assembly back into the shaft by aligning the D-shaped points in the center.
5. Align the point on the front grille with the right point on the casing, then rotate the grille clockwise and install the screw back in place. Repeat the steps for the rear grille.