How do I replace the paper dust bag?
Fully open the zip fastener on the outer bag and pull the cardboard collar from the air duct to remove the used paper dust bag (Fig. 5). Insert a new paper dust bag by pushing its cardboard collar onto the air duct, then tuck it into the outer bag and fully close the zipper.
From the official Hoover F3860-1-011 Floor Polisher manual, page 3
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