I replaced the exhaust filter on my "Classic C1" model with a Miele HEPA SF-HA30 filter which I had to order separately as it is not included is Classic C1. Vacuum. Had to look up YouTube videos because the documentation isn't great for this HEPA setup. You must completely remove the black plastic honeycomb and the soft microfilter "Air Clean" (do not use a double filter, use Air Clean or HEPA - not both). Then tilt the SF-HA30 HEPA filter and insert directly over the opening until fully seated, creating a rubber-lined, airtight seal at the bottom of a quality SF-HA30 HEPA filter. The black mesh on top of the vacuum lid stays in place and looks washable. The pre-motor filter behind the blue combs has a replacement which is free with the purchase of Miele GN packs, looks like it gets replaced with every other full GN pack.
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