The Festool 204201 HEPA Filter for CT 15 / CT 25 / MINI I / MIDI I is a replacement main filter built for select Festool mobile dust extractors. This is a HEPA main filter designed for dust extraction and fine-particle filtration. Model Number 204201. If you are running a CT extractor on wood dust, jobsite cleanup, or general shop debris, this filter is the part that helps keep airflow up while trapping the fine dust you do not want back in the air.

What matters here is not just that it is a replacement filter, but that it is a HEPA-grade filter intended to capture particles down to 0.3 microns. That makes it a practical upgrade or replacement for users who care about cleaner air around sanding, sawing, routing, and cleanup work. Festool also notes that the filter is designed to maintain airflow while allowing the extractor to reach full capacity without clogging or caking as quickly.

The housing is built around a practical plastic frame, which gives the filter cartridge a more durable form than a loose media element. In real use, that matters because replacement parts get handled, stored, and swapped on the job. Festool designed this one for quick, clean replacement from outside the dust extractor, so you do not need to open the machine just to change the main filter. That saves time and keeps the mess more contained.

Compatibility is the key buying point on this part. The Festool 204201 HEPA Filter is intended for CT MINI, CT MINI I, CT MIDI, CT MIDI I units manufactured from 2019 onward, plus CT 15 and CT 25 extractors. If you are ordering a replacement for an older machine, double-check the model and production generation before you buy. For current users of those compatible extractors, this is the correct style of filter for maintaining proper dust extractor performance and HEPA filtration.

This filter makes the most sense for woodworkers, remodelers, finish carpenters, installers, and serious DIY users who rely on a Festool dust extractor as part of their daily setup. If you are cutting indoors, sanding finished surfaces, or trying to keep cleanup under control in occupied spaces, the right main filter is not a small detail. It is one of the parts that keeps the whole dust collection system doing its job.

Small Part, Big Difference in Dust Extraction

The Festool 204201 HEPA Filter is the kind of replacement part that does not look exciting until your extractor starts losing performance and you remember how much fine dust your setup actually handles.

• Who it's for: Festool CT 15, CT 25, CT MINI I, and CT MIDI I owners who want to keep HEPA-level dust extraction working properly in the shop or on the job.
• Why it stands out: Proper fit, HEPA filtration down to 0.3 microns, and an outside-access replacement design that makes maintenance faster and cleaner.
• Worth knowing: Fitment is generation-specific on MINI and MIDI extractors, so make sure your unit is a 2019-and-newer compatible model before ordering.

• What type of product is this? This is a replacement HEPA main filter for select Festool mobile dust extractors.
• Which extractors does it fit? It fits CT 15, CT 25, CT MINI, CT MINI I, CT MIDI, and CT MIDI I models where 2019-and-newer compatibility is specified.
• How fine is the filtration? Festool states that it is designed to trap particles down to 0.3 microns.
• Can the filter be washed? No. The listed specification marks this filter as non-washable.