I have considerably extended the life of several of these Honeywell HEPA filter units by dripping light oil onto the fan shaft (Turn the unit so that the motor is below the fan, allowing the oil to run down into the shaft bearings).
"3-in-1" makes an inexpensive oil dispenser (including oil) having a pull-out tube that allows you to get close to the shaft thru the grillwork.
Is no place to oil it.They have closed type motors. You can just use a lubrificant typeWD40 to spray the mouving parts
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