The Festool SYS-AIR HEPA Air Filter with LS-SYS-AIR 7-3/4-in. Diameter x 19-1/2-ft. Air Supply Hose is a portable jobsite air filtration system built to clean fine airborne dust that your extractor may not catch. This is a HEPA air filter designed for removing lingering dust from indoor work areas during sanding, drilling, and sawing. If you work in finished spaces, occupied homes, shops, or renovation environments where dust control affects cleanup time and customer satisfaction, this setup makes a real difference. Model number: 577791-577964.

What separates this unit from basic dust collection is that it deals with the stuff still floating in the room after tool extraction has done its job. Festool rates the SYS-AIR at up to 680 m³/h of volume flow, which is enough to clean air in rooms up to 57 m² at three air renewals per hour. In plain terms, that means less dust settling back onto floors, benches, trim, cabinets, and freshly finished surfaces. For remodelers and finish crews, that can save a lot of wipe-down time at the end of the day.

The filtration side matters too. This unit uses a two-stage filter system and is built for Dust Class H applications, with filtration greater than 99.995%. That is the kind of spec you pay attention to when the work creates fine, health-hazard dust that hangs in the air long after the cut or sanding pass is finished. Festool also calls out the large TripleV-shaped main filter surface, which helps reduce rapid clogging and extends filter service life. That means more consistent airflow and less downtime for filter changes.

From a design standpoint, Festool did the smart thing and kept it in a Systainer format. That makes the SYS-AIR easier to move, stack, and integrate into a real tool workflow than a bulky standalone purifier. The carrying handle, built-in cord storage, and tool-free access to the preliminary and main filters all add up to something that is practical instead of annoying. There is also a filter contamination indicator, so you are not guessing whether airflow is still where it needs to be.

The included LS-SYS-AIR air supply hose is a big part of why this package is useful on actual jobs. With a 7-3/4 inch diameter and 19-1/2 foot reach, the hose lets you direct airflow where you need it, including awkward spots, behind dust barriers, or closer to the source of airborne dust. That is especially handy in room isolation setups, flooring work, drywall sanding, or any job where the purifier cannot sit right next to the work zone.

Jobsite flexibility is another strong point. The fan speed can be set at two levels, so you can run Eco mode when the room just needs ongoing circulation or switch to maximum air movement during heavy dust-producing work. Festool also states that up to six air purifiers can be connected in series for larger rooms or higher air circulation demands. There is an outlet module with continuous current as well, which adds some convenience when you are building out a dust-control station.

Compatibility is exactly what you would expect from Festool. The SYS-AIR can connect with Festool Systainers and extractors through T-LOC integration, and it can be transported on the SYS-RB roll board or extractor. That matters if you are already invested in the Festool platform, because it drops into the rest of your storage and transport system without becoming one more awkward piece of gear to manage.

Who is this for? Pros first. Remodelers, finish carpenters, flooring installers, drywall crews, cabinet installers, and shop users working indoors will get the most value here. It is also a smart buy for anyone working in customer homes where dust control is part of the job, not an afterthought. If you already run good tool extraction but still deal with fine dust on surfaces and in the air, this is the missing piece.

Festool SYS-AIR HEPA Air Filter with LS-SYS-AIR 7-3/4-in. Diameter x 19-1/2-ft. Air Supply Hose for Serious Indoor Dust Control

If you are already using good extraction and still finding fine dust all over the room, this is the upgrade that actually solves that problem.

• Who it's for: Pros working indoors where dust control affects cleanup time, air quality, and how the customer sees the job when you are done.
• Why it stands out: Dust Class H filtration, strong airflow, Systainer portability, and the long air hose make it more practical on real jobs than a stationary purifier.
• Worth knowing: This is not a replacement for extractor-based dust collection at the tool. It is the follow-up move for airborne dust that extraction leaves behind.

• What kind of dust is this Festool air filter meant to handle? It is built for Dust Class H fine dust and filters harmful airborne particles with greater than 99.995% filtration efficiency.
• How much air can the SYS-AIR move? Festool rates it at up to 680 m³/h.
• Can it be used in larger spaces? Yes. Festool states that up to six air purifiers can be connected in series to increase air circulation when needed.
• Does it work with the Festool storage system? Yes. Festool states it connects with Festool Systainers and extractors through T-LOC integration.