The Festool SYS-AIR HEPA Air Filter with DH-SYS-AIR Ceiling Bracket is a shop air filtration system built for contractors, remodelers, finish trades, and serious woodworkers who need cleaner air in enclosed workspaces. This is a HEPA air filter designed for capturing fine airborne dust left behind after sanding, sawing, and drilling. Model number 577791-578357. If you already use dust extraction at the tool, this unit handles what is still floating around the room.

What makes this product matter is that source extraction and room filtration do two different jobs. Even with a good dust extractor, the finest particles stay suspended in the air and eventually settle on floors, tools, cabinets, trim, and finished surfaces. Festool rates the SYS-AIR for airflow up to 680 m³/h, which is enough to clean air in rooms up to 57 m² at three air changes per hour. In plain terms, it is built to keep work areas cleaner during the job and leave less dust behind when you pack up.

The filtration setup is built around a two-stage system. The preliminary filter catches the bulk of the airborne dust first, which helps protect the main filter and stretch service life. Behind that, the main filter uses a large TripleV-style filter surface to reduce fast clogging and maintain performance longer. Festool also states this unit is rated for Dust Class H applications with a filtration efficiency greater than 99.995%, which is the kind of number buyers look for when health risk and fine dust control are real concerns, not just housekeeping.

The Systainer-based housing is a big part of why this unit stands out. Instead of a bulky box that stays in one corner of the shop, the SYS-AIR is compact, light enough to move around, and designed around the same system thinking Festool users already know. The practical Systainer format and carrying handle make it easier to bring into a punch list job, a cabinet install, or a temporary contained work area. If you work in occupied homes or finished commercial spaces, that cleaner setup and cleaner exit makes a difference with customers.

Jobsite practicality is well thought out here. The fan speed can be set at two levels, giving you an Eco mode when you want quieter, lighter circulation and a maximum setting when you need to move more air. There is also a filter contamination indicator with green and red status lights, so you are not guessing when airflow has dropped off. Festool also notes tool-free access to the preliminary and main filters, which matters because maintenance only helps if it is quick enough that people actually do it.

This version includes the DH-SYS-AIR ceiling bracket, which gives you another way to use the system without giving up valuable floor space. Ceiling mounting makes sense in a shop, sanding bay, or dedicated finishing area where you want air movement overhead and the unit out of the traffic path. It is a cleaner permanent setup than setting the unit on a bench, and it helps keep cords and equipment out of the way in tighter spaces.

Compatibility is another strong point. Festool states the SYS-AIR can connect to all Festool Systainers and extractors via T-LOC, and the Systainer³ M437 format can be integrated into bott vehicle equipment. There is also an electrical outlet module with continuous current for connecting an extractor, power tool, or additional air purifiers, and up to six SYS-AIR units can be connected in series when you need more circulation in larger rooms.

Who should buy it? Anyone working indoors where airborne dust control affects health, cleanup time, or how professional the workspace looks when the job is done. It makes the most sense for finish carpenters, remodelers, painters doing surface prep, flooring installers, cabinet installers, and workshop users who spend hours sanding or cutting in enclosed spaces. If you want a bargain fan with a filter taped to it, this is not that. If you want a purpose-built Festool air filtration solution that fits the system and handles fine dust the right way, this is the one to look at.

Festool SYS-AIR HEPA Air Filter with DH-SYS-AIR Ceiling Bracket is for guys who care about the dust you cannot see

This is a smart buy for indoor work where cleanup, air quality, and a professional-looking jobsite all matter at the same time.

• Who it's for: Pros and serious shop users sanding, cutting, or drilling indoors where airborne dust hangs around after the tool stops.
• Why it stands out: It combines real Dust Class H filtration, strong airflow, a compact Systainer form factor, and the included ceiling bracket for a cleaner permanent setup.
• Worth knowing: This is not a substitute for dust extraction at the tool. It is the next layer that handles the fine dust still floating in the room, which is exactly why it earns its spot.

• What kind of product is this? This is a HEPA air filter and room air purifier designed to remove fine airborne dust from workshops and indoor jobsites.
• How much air can it move? Festool rates the SYS-AIR at up to 680 m³/h.
• How large of a space is it intended for? Festool states it can clean air in rooms up to 57 m² at three air renewals per hour.
• Can it work with other Festool system components? Yes. Festool states it connects to all Festool Systainers and extractors through T-LOC, and up to six SYS-AIR units can be connected in series.