3D Printing • ACD • Zone 20 (internal) • Ordinary location

MTL 302 ACD

ACD vacuum cleaner for the safe collection of combustible plastic powder from 3D printing in ordinary, unclassified locations. Zone 20 internal tank protection certified by IMQ (NB 0738) — documented safety without external ATEX zone requirements. HEPA H14, AISI 304 and M-class antistatic disposable bag included.

ACD II 1/-D — Zone 20 internal tank • 3rd party certified by IMQ (NB 0738)
HEPA H14 — 99.995 % at MPPS • EN 17348 (Dry Type DT)
ESD safe — antistatic construction • M-class disposable bag included
Tank and construction in stainless steel AISI 304 • 40 L
Bypass motor 2.2 kW • 360 m³/h • 74 dB(A)
Manual filter shaking • filter indicator • accessory kit included

MTL 302 ACD — ACD vacuum cleaner for combustible plastic powder in ordinary locations

ACD II 1/-D — Ex h IIIC T80°C Da (internal Zone 20)

IMQ Certified — NB 0738 (3rd party)

EN 17348 — Dry Type DT (combustible dust)

HEPA H14 — EN 1822-5 • M-class filter (IEC 60335-2-69)

ACD — documented safety in ordinary locations

The MTL 302 ACD is Delfin's vacuum cleaner for production environments handling combustible plastic powder from 3D printing where the surroundings are not ATEX-zoned. ACD stands for Applied for Combustible Dust and is not a generic marketing term — it is a technical classification requiring 3rd party certification by a notified body. The MTL 302 ACD is certified by IMQ (Istituto Italiano del Marchio di Qualità, NB 0738) to the marking II 1/-D, documenting that the tank interior is protected to Zone 20 standard.

This is an important distinction: many vacuum cleaners on the market carry the ACD label without being certified for internal Zone 20. The -/1D marking and a certificate from a notified body are the only way to demonstrate to an auditor that the machine genuinely meets the requirements of EN 17348 for collecting combustible dust in unclassified locations.

HEPA H14, M-class filter and manual filter shaking

The filter system consists of a primary Star/Tasche filter in antistatic polyester class M (IEC 60335-2-69) and a HEPA H14 safety filter (99.995 % at MPPS, EN 1822-5). M-class antistatic disposable bags are included as standard — the bag collects the vacuumed powder and can be changed hygienically without direct operator contact. The manual filter shaking function dislodges accumulated dust from the filter without opening the machine.

The powerful 2.2 kW bypass motor delivers 360 m³/h at 2500 mmH₂O vacuum pressure — the highest suction performance in Delfin's MTL range for 3D printing, suited for high-volume collection at large printers or intensive cleaning tasks. Noise level is 74 dB(A) (EN ISO 3744). The control panel has a green/red filter indicator and a no-voltage relay that protects against unintended restart after a power outage.

Technical specifications

Parameter	Value
ACD marking	II 1/-D — Ex h IIIC T80°C Da (internal Zone 20)
External zone	Ordinary (unclassified) location — not approved for ATEX zones externally
Certification	IMQ Certified — 3rd party (IMQ, NB 0738)
Harmonised standard	EN 17348 — Dry Type DT (combustible dust)
Primary filter	Star/Tasche — polyester ANT M (IEC 60335-2-69)
Primary filter area	4,000–360 cm²
Safety filter	HEPA H14 (EN 1822-5) — 99.995 % at MPPS
HEPA filter area	26,000 cm²
Filter cleaning	Manual shaking
Motor type	Bypass
Power	2.2 kW / 2200 W
Voltage	230 V, 50/60 Hz, single phase
Airflow	360 m³/h
Vacuum pressure	2500 mmH₂O
Noise level	74 dB(A) (EN ISO 3744)
Suction inlet	Ø50 mm
Tank capacity	40 L
Tank and construction	Stainless steel AISI 304
Collection system	M-class antistatic disposable bag (included)
Dimensions	44 × 42 × 78 cm (L×W×H)
Weight	25 kg
Duty cycle	Intermittent
ESD safe	Yes — antistatic construction

Compliance and standards: EN 17348 (combustible dust, Dry Type DT) • EN 1822-5 (HEPA filter test) • IEC 60335-2-69 (M-class filter) • EN ISO 3744 (noise measurement). 3rd party certified by IMQ, NB 0738, Milan, Italy.

Accessories

Included

Accessory kit (TA.0527.0000)

Included

M-class antistatic disposable bag (FI.0469.0000)

Classification ACD II 1/-D

Zone (internal) Zone 20 (Da)

Zone (external) Ordinary (unclassified)

Certification IMQ NB 0738 (3rd party)

HEPA filter H14 — 99.995 %

Airflow 360 m³/h

Vacuum pressure 2500 mmH₂O

Power 2.2 kW

Noise level 74 dB(A)

Tank capacity 40 L

Tank AISI 304

Weight 25 kg

Frequently asked questions

What is the difference between ACD and ATEX — and when is ACD sufficient?

ACD (Applied for Combustible Dust) is a technical classification for use in locations that are not ATEX-zoned — typically production rooms, laboratories and packing areas where combustible dust may occur sporadically. The key requirement is that the machine is certified for internal Zone 20 by a notified body, so that the tank atmosphere is protected against ignition during operation. ATEX is mandatory as soon as the production environment is formally classified as Zone 20, 21 or 22 — in that case ACD cannot replace a fully ATEX-certified model. If you are in any doubt about the classification of your environment, we recommend a consultation before selecting a model.

What does the II 1/-D marking mean exactly?

II denotes surface installation (not mining). 1D is category 1 for dust — the highest protection level corresponding to Zone 20, where an explosive dust atmosphere may be present continuously or frequently. The dash before (“-/1D”) indicates that category 1D applies only to the machine's interior — there is no ATEX approval for the external surfaces. The machine may therefore be placed in unclassified locations but not in an external ATEX zone. EPL Da (Equipment Protection Level) confirms the high internal protection level. T80°C is the maximum surface temperature on internal components.

What makes the M-class antistatic disposable bag special?

M-class (IEC 60335-2-69) is the highest filter class for vacuum cleaner primary filters and requires a retention efficiency of at least 99.9 % for particles down to the relevant size range. The antistatic material ensures that electrostatic charge does not build up in the bag during operation — a critical property when the collected material is combustible. The bag is sealed before removal, so the operator does not come into direct contact with the powder during disposal. Part number FI.0469.0000 from Delfin.

Can the MTL 302 ACD handle both plastic powder and organic dust?

Yes — within dry recovery and in unclassified locations. The marking IIIC T80°C Da covers dust group IIIC (including conductive and non-conductive organic dust) at a maximum surface temperature of 80°C. This is relevant for typical plastic powders from SLS/MJF 3D printing (PA12, PA11, TPU) as well as for organic dusts such as starch, sugar, lactose and API powders with comparable ignition characteristics. Contact Particulair for a specific assessment of your powder type and operating conditions.

What is included in the accessory kit?

The accessory kit (TA.0527.0000) includes a suction hose assembly, bent suction tubes, a crevice tool and a floor nozzle — all components in antistatic or conductive material suitable for use with combustible dust. The M-class antistatic disposable bag (FI.0469.0000) is also included as standard. Contact Particulair for details on additional accessories for specific 3D printers or processes.

Is the MTL 302 ACD the right solution for you?

We can help clarify whether the ACD model suits your location classification, powder type and operating pattern — or whether an ATEX-certified model is the correct choice.