Delfin ZFR 75 INERT
Three-phase ATEX vacuum for Zone 22 with INERT neutralisation bath -- side-channel blower for 24/7 duty, 44 L total tank and H-HEPA final filtration
- 24/7 central cleanup of reactive metal powder in Zone 22
- Large 3D-printing farms with aluminium or titanium powder
- Stationary installation at defense ammunition facilities
- Powder metallurgy with round-the-clock operation and pyrophoric powders
- Battery production with large volumes of reactive electrode materials
- ATEX Directive 2014/34/EU -- II 3D Ex h tc IIIC T80°C (int) /T165°C (ext) Dc
- EN 17348:2022 (harmonized March 2023)
- IEC 60335-2-69 (industrial vacuums)
Delfin ZFR 75 INERT
The Delfin ZFR 75 INERT is the three-phase INERT version of the Zefiro family: a side-channel blower (3 kW, 6.5 A, 400 V) built for 24/7 continuous operation without maintenance, combined with a 44-litre neutralisation tank (37 L liquid + 7 L material) in AISI 304. The included pressure relief valve protects against overpressure when the filter clogs, and the H-HEPA final filter (99.995 % MPPS per EN 1822-5) ensures clean exhaust. ATEX-certified for Zone 22 (II 3D Ex h tc IIIC) and performance-tested to EN 17348:2022. Suited to large reactive powder volumes where 24-hour operation is required.
Applications
- 24/7 central cleanup of reactive metal powder in Zone 22
- Large 3D-printing farms with aluminium or titanium powder
- Stationary installation at defense ammunition facilities
- Powder metallurgy with round-the-clock operation and pyrophoric powders
- Battery production with large volumes of reactive electrode materials
Technical specifications
| ATEX marking | II 3D Ex h tc IIIC T80°C (int) /T165°C (ext) Dc |
|---|---|
| Internal / external zone | 22 / 22 |
| Motor type | Sidekanalblaeser, 3-faset (3 kW, 6,5 A) |
| Duty cycle | Continuous |
| Airflow | 318 m³/h |
| Vacuum | 294 mbar (3000 mmH₂O) |
| Container | 44 L |
| Sound pressure | 75 dB(A) |
| Filter class | H class |
| Filter type | Klasse H HEPA H14 (EN 1822-5), 99,995 % MPPS, 26.000 cm² filterflade |
| Primary filter | Stjerne/taske polyester ANT M-klasse antistatisk, 30.000 cm², diameter 500 mm |
| Cleaning system | Manuel filterrensning + trykudligningsventil inkluderet |
| Collection system | INERT neutralisation bath |
| Material | Lakeret staalkonstruktion (krop), AISI 304 INERT-beholder, ABS tilbehoersholder |
| IP class | IP65 |
| Power | 3.0 kW |
| Current | 6.5 A |
| Voltage | 400 V / 50 Hz / 3~ |
| Inlet | Ø 50 mm |
| Dimensions (L × W × H) | 790 x 660 x 1700 mm |
| Weight | 95 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 (typically water with a passivating agent added), 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.
Tested to EN 17348:2022
The INERT range is certified and performance-tested to EN 17348:2022, the harmonized European standard for industrial vacuum cleaners in ATEX zones. The test confirms that the neutralisation system actually inactivates reactive dust under real operating conditions — not merely in a lab setup. 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 at shooting ranges (lead dust and primer residue from cartridges), 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 are ACD-certified (IEC 60335-2-69 Annex AA) 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 uncompromising filtration.
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, lead dust from shooting ranges), where conventional dry collection would itself be an ignition source.
Is the INERT system tested to EN 17348:2022?
Yes. The entire Delfin INERT range is performance-tested to EN 17348:2022 -- the harmonized European standard for industrial vacuum cleaners in ATEX zones. The test confirms that the neutralisation bath actually inactivates reactive dust under real operating conditions, not just in a lab setup. Documentation available on request.
What types of dust is INERT technology intended for?
Reactive metallic dust: aluminium and aluminium alloys, titanium, magnesium, zirconium, fine iron powder, lead dust and primer residue from shooting ranges, and pyrophoric powders from aerospace and defense. 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/Incluso as standard on all INERT models.
What is the difference between the ZFR 75 INERT and the DM2 1/3D INERT?
Both are ATEX-certified and have a 44 L INERT tank, but motor technology differs: the ZFR 75 INERT has a three-phase side-channel blower built for 24/7 continuous operation without maintenance, while the DM2 1/3D INERT has a single-phase bypass motor for periodic duty. Choose the ZFR 75 if the plant requires round-the-clock operation and has three-phase supply; choose the DM2 if the duty pattern is periodic and only single-phase is available.
Why is there a pressure relief valve?
Side-channel blowers deliver a constant vacuum, even when the filter is partially clogged. Without pressure relief the rising vacuum could damage the primary filter or draw liquid into the filter chamber. The pressure relief valve opens automatically at a preset value and stabilises the vacuum -- without stopping the machine. A safety element that protects both filter and neutralisation bath during prolonged operation.