The Festool 205412 Main HEPA Filter for CT 26 / CT 36 / CT 36 AC / CT 48 / CT 48 (AC) AutoClean is a replacement main filter for select Festool dust extractors. This is a main HEPA filter designed for dust extraction and fine-particle collection in compatible CT vacuums. Model Number 205412. If you rely on your extractor for shop cleanup, jobsite dust control, or keeping fine sanding and cutting dust contained, this is the part that keeps the machine filtering at a high level.

The big reason this filter matters is filtration performance. Based on the provided product data, it filters 99.97% of particles down to 0.3 micron in size. That is the spec buyers care about because fine dust is the stuff that hangs in the air, clogs up work areas, and puts more strain on the whole dust collection system. A proper HEPA main filter helps your extractor hold onto that dust instead of pushing it back into the room.

This Festool main filter is designed as a direct replacement for the factory-installed filter in compatible CT units. That makes it the practical choice for maintenance instead of a generic substitute that may or may not fit right. When a filter is built around the vacuum it is meant for, installation is more straightforward and sealing is more dependable, which is exactly what you want on a machine that lives or dies by airflow and filtration.

Festool also calls out tool-free installation, which is more important than it sounds. On a busy day, nobody wants routine maintenance turning into a project. Being able to replace the filter quickly means less downtime and less temptation to keep running a vacuum with a loaded or worn filter. For pros who use a CT extractor every day, that is a real time-saver.

This replacement filter is specifically described as a HEPA main filter designed for use with the AutoClean function. That makes it especially relevant for users running compatible AutoClean extractors where the filter needs to work with the vacuum's intended cleaning cycle and dust-handling setup. It is also listed as suitable for CT 36 AC and CT 48 AC, while other seller data expands fitment to CT 26, CT 36, CT 36 AC, CT 48, and CT 48 AC. Either way, the clear takeaway is that this is a Festool system-matched filter for CT-series extractors, not a universal shop vacuum filter.

Who should buy it? Anyone maintaining a compatible Festool CT extractor and wanting to keep HEPA-level filtration in place. It makes sense for woodworkers dealing with sanding dust, remodelers trying to keep occupied spaces cleaner, and general contractors who depend on dust extraction as part of the job rather than an afterthought. If your extractor is one of the listed compatible models, this is one of those maintenance parts worth buying before the old filter becomes the weak link.

Festool 205412 Main HEPA Filter for CT 26 / CT 36 / CT 36 AC / CT 48 / CT 48 (AC) AutoClean is the kind of maintenance part worth buying before you need it

If you already own a compatible Festool extractor, this filter is the simple way to keep HEPA performance where it belongs instead of hoping an old loaded filter still has something left.

• Who it's for: Festool CT extractor owners who want to maintain proper fine-dust filtration in the shop or on the job.
• Why it stands out: Direct-fit Festool replacement, HEPA filtration down to 0.3 micron, and tool-free installation make it a no-nonsense maintenance buy.
• Worth knowing: This is a replacement filter, not a universal vacuum accessory, so check your CT model before ordering.

• What kind of product is this? This is a replacement main HEPA filter for compatible Festool CT dust extractors.
• What does it filter? The provided product data states it filters 99.97% of particles down to 0.3 micron in size.
• Which machines does it fit? Seller data lists compatibility with Festool CT 26, CT 36, CT 36 AC, CT 48, and CT 48 AC models.
• Does it require tools to install? No. The product data specifies tool-free installation.