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These are the replacement Pre-filters for your Beam Air. There are 4 per pack and they need to be replaced every 10-30 hours.
Don't forget to replace all filters in time:
Just open the top cover of the filter and remove the box from the inside. Then take out the Pre-filter and pull on the lids on each side of the Medium efficiency filter, put this aside and repeat the same steps with the charcoal filter. The box that's left is the H13 HEPA filter. Replace what is necessary.
Reinsert the filters in this order: From left to right
Close the lid and you are ready to go back to creating more awesome creations!