The Festool 577790 SYS-AIR Air Filtration System is a compact corded air filter built to pull fine airborne dust out of the air after your extractor has done the heavy lifting. This is a corded air filtration system designed for filtering airborne dust in workshops and job sites. Model Number: 577790. If you work in renovation, demolition, sanding, or finish work where dust control matters to the crew and the customer, this unit is made to keep the space cleaner and the air easier to breathe.

What makes this unit useful is that it targets the dust you cannot always catch at the source. Festool rates it at up to 423 cubic feet per minute, with coverage for rooms up to 613 square feet and up to three air changes per hour. In plain terms, that means it keeps air moving and filtering in smaller rooms, work zones, and closed-off remodel spaces where fine dust tends to linger long after the cutting or sanding stops.

The filtration setup is more than just a fan in a box. The SYS-AIR uses a two-stage filter system with a preliminary filter that catches the bulk of the debris before it reaches the main filter. That helps protect the main filter, cuts down on clogging, and makes maintenance more practical. Festool also uses its TripleV main filter design with a large surface area, which is meant to maintain airflow longer and stretch filter life instead of loading up too quickly.

Jobsite practicality is where this tool separates itself from larger stationary air scrubbers. The housing is built in a Systainer3 M437 format, so it stores and transports like the rest of the Festool system. At about 21.82 pounds, it is light enough to move room to room without making it a whole production. The built-in handle, cord storage in the lid compartment, and T-LOC compatibility all make sense for contractors who are already running mobile setups and do not want another awkward piece of equipment rolling around the van.

Festool also paid attention to how the air leaves the machine. Instead of blasting air straight across the room and kicking settled dust back up, the airflow disperses upward in three directions to the left, right, and rear. That helps reduce disruptive air currents around the work area. You also get two airflow settings, so you can back it down when conditions are lighter or step it up when dust levels are higher.

On the maintenance side, there is a signal light that alerts you when the filter is clogged or needs replacement. That is the kind of feature that actually matters because air filters only help when they are moving air the way they should. There is also a connection port for a 7-7/8 inch (200 millimeter) air supply hose accessory for hard-to-reach areas or temporary dust protection barriers, which opens up more targeted use in contained work zones.

Compatibility is another strong point. The unit connects to Systainers and Festool extractors via T-LOC and can also be integrated into Systainer Systems vehicle racking systems. If you already work inside the Festool storage and transport platform, the SYS-AIR fits the way your other gear fits. That is a real advantage over standalone air filters that do the job but do not travel or store well.

Who should buy it? This air filter makes the most sense for remodelers, finish carpenters, painters doing prep work, flooring installers, and anyone dealing with enclosed indoor dust control. It is also a smart add-on for shops where sawdust and fine sanding dust settle on benches, tools, and finished work. If your goal is not just extraction at the tool but cleaner ambient air after the cut, the Festool 577790 SYS-AIR Air Filtration System is built exactly for that job.

Not a Dust Extractor Replacement. A Smart Dust Control Upgrade.

The Festool 577790 SYS-AIR Air Filtration System is the kind of tool that makes sense the minute you start caring about what is still floating in the room after the tool work is done.

• Who it's for: Contractors and serious shop users working in enclosed spaces, finished homes, remodel zones, or workshops where fine airborne dust is the real problem.
• Why it stands out: It combines strong airflow, two-stage filtration, and true Systainer portability in a package that is easier to move and store than a traditional air scrubber.
• Worth knowing: This is a corded air filter, not a source-capture extractor. It works best as part of a full dust-control setup, especially when you already use Festool Systainers and extractors.

• What kind of product is this? It is a mobile air filtration system designed to filter airborne dust in job sites and workshops.
• How much air can it move? The maximum volume flow is 423 cubic feet per minute.
• Can it connect with Festool Systainers? Yes. It connects to Systainers and extractors via T-LOC and can also be integrated into Systainer vehicle racking systems.
• Does it warn you when the filter needs attention? Yes. It has a signal light that alerts you when filters are clogged or need replacing.