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How do I tighten a loose fan blade in my new air purifier?

FAN Blade clamp tightening instructions for all new models:
LA-2000 to Classic LA-3500 (Model #: E300/RH02; 300/RH02; 300/H02; 300/UH02; HL2PRO; ZL-3500/UV)

In order to tighten the fan blade, you will need to take the unit apart. It's quite easy to remove the chassis (unit mechanism) from the cabinet. This is what you have to do, which takes about 15 minutes:

  1. Unscrew the 2 knobs on the front of the unit. This is the 03/Sanitizer left knob and the Fan/UV right knob. You will see that each knob is attached to the unit with a small screw. Look at each knob and locate the little round opening within each knob to access the screws.
  2. Once the single screw has been undone on each knob, carefully flip the unit upside down, and place it in this upside down position on hard surface (table, countertop, etc.) and unscrew the 2 bottom bolts. Once this is done, carefully flip the unit back to its upright position, set it on hard surface and now you can remove the chassis from the cabinet. Once it has been removed, set it on hard surface.
  3. Now, carefully unscrew and remove the metal protection bar in front of the blade to have easy access to the blade. The blade should be positioned/sitting in the middle of the fan motor shaft, which is about half way from the fan motor body and half way from the front of the fan motor shaft. It should not be too close to the fan motor body, and not at the very front of the fan motor shaft either, because then it may touch the 2 metal prongs of the negative ionizer. So again, it should be placed in the middle of the fan motor shaft about an inch away from each end of the fan motor. Without removing the fan blade, tighten the metal clamp of the fan blade by using pliers. This small metal clamp is right in the middle of the fan blade over its opening through which the fan motor shaft fits.
  4. Next, carefully reattach the metal bar in front of the fan blade (and screw in the green ground wire connecting to the metal bar, if applicable to your model). Then put the chassis back into the cabinet all the way and reassemble the unit by following the instructions above in reverse. Monitor the fan blade movement for the next few days to see if the problem has been resolved.