Delfin 452 ACD INERT
Single-phase ACD vacuum with INERT neutralisation bath -- two bypass motors, 15 L total tank in AISI 304, HEPA H14 final filter and declared conformity with EN 17348:2022
- Ammunition manufacturing and military production facilities
- 3D printing with aluminium or titanium powder (outside ATEX zones)
- Light-metal grinding and machining in aerospace and automotive
- Powder metallurgy with reactive alloys in non-ATEX workshops
- IEC 60335-2-69 Annex AA (ACD)
- Low Voltage Directive 2014/35/EU
- EMC Directive 2014/30/EU
Delfin 452 ACD INERT
The Delfin 452 ACD INERT collects combustible and reactive metallic dust in non-ATEX-classified areas in a fundamentally different way from a standard industrial vacuum: dust is channelled directly into a neutralising liquid bath inside the AISI 304 tank, where the reactive particle is inactivated instantly. This eliminates self-ignition and reaction with oxygen or moisture. Two single-phase bypass motors deliver 360 m³/h airflow at 245 mbar, and the HEPA H14 final filter (99.995 % MPPS) ensures clean exhaust. The machine complies with IEC 60335-2-69 Annex AA (ACD); Delfin declares conformity of the INERT range with EN 17348:2022. The zone classification of the area always follows from the risk assessment, not from the choice of vacuum cleaner.
Applications
- Ammunition manufacturing and military production facilities
- 3D printing with aluminium or titanium powder (outside ATEX zones)
- Light-metal grinding and machining in aerospace and automotive
- Powder metallurgy with reactive alloys in non-ATEX workshops
Technical specifications
| ATEX marking | II 1/-D Ex h IIIC T80°C (Internal) Da/- |
|---|---|
| Internal / external zone | 20 / non-ATEX |
| Motor type | Single-phase bypass motor (2.3 kW) |
| Duty cycle | Periodic |
| Airflow | 360 m³/h |
| Vacuum | 245 mbar (2500 mmH₂O) |
| Container | 15 L |
| Sound pressure | 74 dB(A) |
| Filter class | H class |
| Filter type | HEPA H14 (EN 1822-5), 99,995 % MPPS, 20.500 cm² filterflade |
| Primary filter | Star/bag filter, polyester ANT M class, antistatic, 20,000 cm², diameter 420 mm |
| Cleaning system | Manual filter cleaning + clogging indicator |
| Collection system | INERT neutralisation bath |
| Material | Painted steel construction, AISI 304 INERT container |
| IP class | IP64 |
| Power | 2.3 kW |
| Current | 10 A |
| Voltage | 115/230 V / 50-60 Hz |
| Inlet | Ø 50 mm |
| Dimensions (L × W × H) | 610 x 660 x 1330 mm |
| Weight | 52 kg |
INERT TECHNOLOGY — EN 17348:2022
What is an INERT vacuum cleaner?
Delfin's INERT vacuum cleaners are built to collect reactive metallic dust — the kind of dust that can self-ignite or react violently with oxygen, heat or water. Instead of collecting dust dry in a bag or container, the vacuum channels it directly into a neutralising liquid bath (normally water; for some metals, oil), where the reactive metal particle is inactivated on the spot. That is the difference between a controlled process and a vacuum that can itself become the ignition source.
Conformity with EN 17348:2022
Delfin has followed EN 17348:2022 – the harmonised European standard that sets out what the manufacturer of industrial vacuum cleaners for potentially explosive atmospheres must do – and declares conformity with it. The declaration does not by itself approve an ACD model for ATEX zones, and it does not confirm that every reactive dust is neutralised. Combined with HEPA H14 final filtration (99.995 % efficiency at MPPS per EN 1822-5), the exhaust is clean down to the finest health-hazardous particles.
Typical applications
INERT vacuums are used in ammunition manufacturing, for 3D printing with metal powders (aluminium and titanium are highly reactive when finely divided), in light-metal machining in aerospace and defense, and at process plants where pyrophoric powders such as zirconium and magnesium are handled. Some models comply with IEC 60335-2-69 Annex AA (ACD) for non-ATEX-classified areas, others are ATEX-certified for Zone 20, 21 or 22 — but they all share the same neutralising liquid bath and the same filtration. The 452 ACD INERT is not approved for lead dust or primer residue from shooting ranges.
INERT versus conventional HEPA filtration
A conventional HEPA vacuum retains particles in a filter but leaves them dry and potentially reactive. With reactive metallic dust that is not enough — the particle may react with oxygen (exothermic oxidation) or moisture (hydrolysis of certain metal hydrides) and disrupt the collection process itself. INERT technology solves this by inactivating the particle at the moment of collection: dust is immersed in the liquid before it can react, and the HEPA H14 filter then captures any residual aerosol before exhaust.
Questions and answers
What does INERT mean in this context?
INERT denotes a vacuum cleaner with a neutralising liquid bath in the collection tank. Dust is channelled directly into the liquid and inactivated immediately, so it cannot react with oxygen, heat or sparks. The technology is developed for reactive metallic dust (aluminium, titanium, magnesium, zirconium), where conventional dry collection would itself be an ignition source. The 452 ACD INERT is not approved for lead dust or primer residue from shooting ranges.
Does the INERT system conform to EN 17348:2022?
Delfin has followed EN 17348:2022 -- the standard that sets out what the manufacturer must do -- and declares conformity for the INERT range. There is no separate test report, and the declaration does not mean that the bath neutralises every reactive dust; please check suitability for your material with us before purchase.
What types of dust is INERT technology intended for?
Reactive metallic dust: aluminium and aluminium alloys, titanium, magnesium, zirconium, fine iron powder and pyrophoric powders from aerospace and defense. The 452 ACD INERT is not approved for lead dust or primer residue from shooting ranges. For non-reactive dust (organic process dust, plastics, etc.) the INERT technology adds no further safety -- a standard ATEX or ACD model without liquid bath is selected instead.
How does the HEPA H14 final filter work together with the liquid bath?
The neutralisation bath inactivates dust at the moment of collection, but there will always be a fine aerosol fraction that passes the liquid surface. The HEPA H14 filter captures 99.995 % of particles down to 0.3 micrometres per EN 1822-5 (MPPS method) before exhaust. The combination secures both safe collection (no reactive dry particle) and clean exhaust (no health-hazardous aerosol). The filter is included as standard on all INERT models.
Why ACD instead of ATEX?
ACD (IEC 60335-2-69 Annex AA) applies to areas that are NOT ATEX-classified, but where the dust itself poses an ignition risk. In smaller 3D-printing workshops, for example, the building and operation are often not ATEX-classified, even though the metal powder is reactive. The 452 ACD INERT is designed for that situation; the zone classification of the area always follows from the risk assessment, not from the choice of vacuum cleaner.
How is the liquid bath maintained?
The neutralisation bath is replaced after each full loading (approx. 5 L collected material). The spent liquid with inactivated dust is disposed of as hazardous waste per local regulations -- typically as metal-bearing sludge. Fresh liquid suited to the material (normally water; for some metals, oil) is filled to the 10 L mark. A full cycle takes 5-10 minutes and requires no tools, only PPE.