Key Features
Clears Fine DustThe two-stage HEPA filtration system captures airborne dust your extractor can miss, so less debris settles on finished surfaces, tools, and the air you breathe. Jobsite-Ready SizeThis Festool air filter packs into a Systainer format and weighs 21.82 lbs, which makes it much easier to move room to room than a bulky shop air cleaner. Adjust Airflow FastTwo airflow levels let you match output to the dust load, and the warning light tells you when the filters need attention instead of leaving you guessing.
Overview
The Festool 577791 Air Filter SYS-AIR HEPA is a compact mobile air filter built for workshops, remodel work, and job sites where fine airborne dust hangs in the room after cutting, sanding, drilling, or demolition. This is a corded HEPA air filter designed for capturing airborne dust in workshops and job sites. Model Number: 577791. If you already run dust extraction at the tool, this unit handles the dust that still escapes and keeps it from settling back onto finished work, equipment, and the space around you.
The big reason this unit matters is simple: source extraction does not catch everything. Festool rates the SYS-AIR HEPA for up to 264.8 cfm maximum airflow, with product highlights also noting up to 400 cfm in broader use messaging. In practical terms, that means active air circulation that helps pull suspended fine dust through a two-stage filter setup instead of letting it drift through the room. Festool also states filtration over 99.9%, which is exactly what you want when you’re working in renovation spaces, occupied homes, or shops where dust control affects cleanup time and the final result.
The design is what makes this tool more useful on real jobs than a typical stationary air cleaner. The housing is built in Systainer3 M437 format, so it carries like a piece of the rest of your Festool system instead of an awkward appliance. At 21.82 lbs, it is light enough to move where the dust actually is. The integrated handle, onboard cord storage in the lid compartment, and T-LOC connection points all add up to a machine that feels like it belongs on a jobsite, not just in a fixed shop corner.
Festool also put some thought into how the air moves through the room. Instead of blasting dirty air straight across the space and stirring everything back up, the SYS-AIR HEPA disperses filtered airflow upward in three directions to the left, right, and back. That helps reduce disruptive air currents and keeps the unit from just pushing dust around. For remodelers working in finished spaces or stairwells, that is a practical feature, not a brochure line.
The filter layout is built to keep maintenance reasonable. A preliminary filter catches the bulk of the dust first, protecting the TripleV HEPA main filter and helping extend its service life. Festool also includes a signal light that tells you when the filters are clogged or due for replacement, which is a lot better than waiting until performance drops off and the room starts looking dusty again.
On the power side, this is a 120 VAC corded unit with 200 watts of power consumption and a 9.843 ft cable. That setup makes sense for all-day shop use and long renovation tasks where steady runtime matters more than battery convenience. It is made to run while work is happening or during cleanup after the dustiest part of the job is done.
The system angle is another strong point. The unit connects to Systainers and extractors via T-LOC, can be integrated into Systainer Systems vehicle racking, and includes a connection port for an optional 7-7/8 in air supply hose for hard-to-reach areas or dust barrier setups. That makes it useful not just as a stand-alone workshop air purifier, but as part of a broader dust-control setup for containment and renovation work.
Who should buy it? Contractors doing demolition, renovation, finish remodeling, punch work, and shop-based sanding or cutting will get the most out of it. If you need a quiet, portable HEPA air filter that works alongside a dust extractor instead of replacing one, the SYS-AIR HEPA makes a lot of sense. If your main need is vacuuming chips at the tool, buy an extractor first. If the problem is the fine dust left floating in the room after the tool stops, this is the right type of machine.
Cleaner Air in Tight Work Areas
When you’re working in stairwells, hallways, sealed-off rooms, or remodel spaces, airborne dust is the problem that lingers after the cut. The SYS-AIR HEPA is built to keep air moving and pull that fine dust out of the space.
- Optional connection port accepts a 7-7/8 in air supply hose for hard-to-reach areas and dust protection barriers
- Best suited for demolition, renovation, and jobs where direct extraction is tough or not an option
Two-Stage Filtration That Cuts Cleanup
The filter setup is designed to protect the expensive filter and keep performance more consistent. The preliminary filter catches most of the dust load first, so the main HEPA filter can do the fine work without clogging as quickly.
- Includes preliminary filter VF-SYS-AIR and main filter HF-SYS-AIR H/HEPA
- TripleV main filter design provides a large surface area to reduce clogging and extend service life
Simple Controls, Easy to Place
This unit is straightforward to use on the job. Set the airflow level you need, place it where it can circulate the room, and let the warning light tell you when the filters need attention.
- Two airflow levels let you respond to changing dust conditions
- Noise level ranges from 55 to 65 dB, which is manageable for shop and indoor jobsite use
Fits the Festool Transport System
A lot of air cleaners work fine once they’re set down, but getting them to and from the site is the pain. This one is built around the Systainer platform, so it moves and stores like the rest of your Festool gear.
- Connects to Systainers and extractors via T-LOC
- Can be integrated into Systainer Systems vehicle racking and transported with the SYS-RB cart or an extractor
What’s in the Box
- (1) Festool SYS-AIR HEPA air filter
- (1) Preliminary Filter VF-SYS-AIR
- (1) Main Filter HF-SYS-AIR H/HEPA
Air supply hose and mounting accessories are sold separately.
Key Specifications
| Power Consumption | 200 W |
|---|---|
| Power Source | 120 VAC corded electric |
| Max. Volume Flow | 264.8 CFM |
| Dust Class | HEPA |
| Noise Level | 55 to 65 dB |
| Cable Length | 9.843 ft |
| Weight | 21.82 lbs |
| Dimensions (L x W x H) | 15.6 in x 11.6 in x 17.2 in |
Compatibility
Systainer SystemConnects to Festool Systainers and extractors via T-LOC for transport and storage integration. Vehicle RackingCan be integrated into Systainer Systems vehicle racking for organized mobile setups. Air Hose ConnectionIncludes a port for a 7-7/8 in (200 mm) air supply hose accessory to direct airflow where a standard placement will not reach.
Built For
Demolition Renovation Remodeling Workshop Air Quality Dust Containment Areas General Contracting Finish Work Cleanup Occupied Jobsite Interiors
Pro Tip
Set the SYS-AIR HEPA so the exhaust can throw cleaned air upward and outward, not straight at the dust source. You will get better room circulation and less chance of kicking settled dust back into the work zone.
At a Glance
264.8 CFMMax Airflow 200 WPower Consumption 21.82 lbsWeight 55-65 dBNoise Range
Tool Nut’s Take
Tool Nut’s Take
Festool 577791 Air Filter SYS-AIR HEPA is the dust-control add-on pros actually notice
If your extractor handles the chips but the room still looks hazy and dusty afterward, this is the piece that finishes the job.
- Who it’s for: Remodelers, finish contractors, and shop users who already care about dust control and want cleaner air in the room, not just at the tool.
- Why it stands out: The Systainer format, HEPA two-stage filtration, hose connection option, and T-LOC system compatibility make it far more jobsite-friendly than a generic air purifier.
- Worth knowing: This is not a substitute for a dust extractor. Use it alongside extraction for the best result, especially on sanding, cutting, and demolition work.
Common Questions
- What kind of product is this? It is a corded HEPA air filter made to remove airborne dust from workshops and job sites.
- Can it replace a dust extractor? No. The SYS-AIR HEPA is meant to capture fine dust left in the room after or during work, while a dust extractor captures debris at the tool.
- Does it have adjustable airflow? Yes. Festool specifies two airflow levels so you can match output to the dust conditions in the space.
- Does it work with the Festool Systainer system? Yes. It connects to Systainers and extractors via T-LOC and can be integrated into Systainer Systems vehicle racking.
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