3D Printing • Electric • ATEX II 1/2D • Zone 20 (internal) / Zone 21 (external)

MTL 301 1/2D

Compact electric ATEX vacuum cleaner for combustible plastic powder from medical and dental 3D printing. Zone 20 internal tank protection and Zone 21 external (Db) — the broadest external dust zone certification in Delfin's MTL range. HEPA H14, AISI 304 and M-class antistatic disposable bag included. Certified by IMQ and IECEx.

ATEX II 1/2D — Zone 20 internal (Da) • Zone 21 external (Db) • IMQ + IECEx
HEPA H14 — 99.995 % at MPPS • EN 17348 (Dry Type DT)
ESD safe • Dust Tight IP64 • M-class antistatic disposable bag included
Full stainless steel AISI 304 construction • 40 L
Bypass motor 1.1 kW • 215 m³/h • 74 dB(A) • brushless motor available
Manual filter shaking • filter indicator • accessory kit included

MTL 301 1/2D — compact electric ATEX vacuum cleaner with Zone 20 internal and Zone 21 external for 3D printing

ATEX 2014/34/EU — II 1/2D • T80°C (Int) Da / T95°C (ext) Db

IMQ Certified (NB 0738) • IECEx — 3rd party

EN 17348 — Dry Type DT • Dust Tight IP64

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

Zone 21 external — the broadest external dust zone certificate in the class

The MTL 301 1/2D is Delfin's ATEX vacuum cleaner with the broadest combined zone certification in the MTL range for 3D printing: Zone 20 internal (category 1D, EPL Da) and Zone 21 external (category 2D, EPL Db). This makes it the only model in the range that may be placed in production environments classified as external Zone 21 — areas where an explosive dust atmosphere may occasionally be present in the surroundings under normal operating conditions. Zone 21 is more stringent than Zone 22 and demands a higher external protection level (Db over Dc).

The unit is 3rd party certified by both IMQ (NB 0738) and IECEx, providing both EU ATEX coverage and international recognition in more than 30 countries including Norway, Switzerland, Australia and the Gulf States. The Dust Tight IP64 rating on the motor unit ensures that neither dust nor liquid can reach the electrical system.

HEPA H14, M-class filter and brushless motor option

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). An M-class antistatic disposable bag is included as standard — the bag collects the vacuumed powder and can be changed hygienically without direct operator contact. Manual filter shaking dislodges accumulated dust from the filter without opening the machine.

The standard motor is a 1.1 kW bypass motor delivering 215 m³/h at 2250 mmH₂O vacuum pressure. A brushless motor is available as an option for environments requiring longer motor service life. Noise level is 74 dB(A) (EN ISO 3744). The unit operates on 115–230 V single phase, making it suitable for both European and international installations. At 26 kg, it is compact enough to move easily between 3D printers.

Technical specifications

Parameter	Value
ATEX marking	II 1/2D — Ex h tb IIIC T80°C (Int) / T95°C (ext) Da/Db
ATEX zones	Zone 20 internal (Da) • Zone 21 external (Db)
Certification	IMQ Certified (NB 0738) + IECEx — 3rd party
Harmonised standard	EN 17348 — Dry Type DT (combustible dust)
Dust protection	Dust Tight IP64
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	11,000 cm²
Filter cleaning	Manual shaking
Motor type	Bypass (brushless motor available)
Power	1.1 kW / 1100 W
Voltage	115–230 V, 50/60 Hz, single phase
Airflow	215 m³/h
Vacuum pressure	2250 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 × 84 cm (L×W×H)
Weight	26 kg
Duty cycle	Intermittent
Operating temperature	−5°C ≤ Ta ≤ +37°C
ESD safe	Yes — antistatic construction

Compliance and standards: ATEX Directive 2014/34/EU • 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) and IECEx.

Accessories

Included

Accessory kit (TA.0527.0000)

Included

M-class antistatic disposable bag (FI.0469.0000)

ATEX II 1/2D

Zone (internal) Zone 20 (Da) • T80°C

Zone (external) Zone 21 (Db) • T95°C

Certification IMQ (NB 0738) + IECEx

HEPA filter H14 — 99.995 %

Airflow 215 m³/h

Vacuum pressure 2250 mmH₂O

Power 1.1 kW

Noise level 74 dB(A)

Tank capacity 40 L

Weight 26 kg

Voltage 115–230 V

Frequently asked questions

What is the practical difference between II 1/2D and II 1/3D?

Both classifications provide Zone 20 protection internally in the tank (1D). The difference is the external classification: II 1/3D (such as the Tiger-Vac C-10 EX and Delfin MTL 301 1/3D) provides external Zone 22, while II 1/2D provides external Zone 21. Zone 21 is more stringent, covering areas where an explosive dust atmosphere may occasionally be present under normal operating conditions — typically production lines with frequent handling of fine combustible powder or areas with inadequate ventilation. If your ATEX risk assessment has resulted in an external Zone 21 classification, the MTL 301 1/2D is the correct choice.

What does the IECEx certification add beyond ATEX?

The ATEX Directive applies within the EU and EEA. IECEx is an international certification scheme recognised in more than 30 countries — including Norway, Switzerland, Australia, South Africa and the Gulf States. For companies with facilities or supplier relationships outside the EU, the IECEx certificate is the documentation that applies. Both certificates are issued by IMQ on the basis of the same 3rd party testing and cover the same construction and ATEX classification.

What does Dust Tight IP64 on the motor unit mean?

IP64 is a combined protection rating: 6 means complete protection against dust ingress (dust tight), and 4 means protection against water splashing from any direction. For an ATEX vacuum cleaner, the dust tightness is particularly important — it guarantees that combustible powder cannot enter the motor housing and come into contact with electrical components that could potentially act as a heat source or spark. IP64 is the requirement in EN 17348 for external Zone 21.

When should the brushless motor option be selected?

The brushless motor is relevant when longer motor service life, fewer planned service intervals or lower heat generation during extended operating periods are required. The mechanical design without carbon brushes reduces wear and significantly extends the expected service life compared to a conventional bypass motor. Contact Particulair for pricing and lead time on the MTL 301 1/2D with brushless motor.

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 in antistatic or conductive material suitable for use with combustible dust in ATEX Zone 21. The M-class antistatic disposable bag (FI.0469.0000) is also included as standard. Contact Particulair for additional accessories or configurations for specific 3D printers.

Is the MTL 301 1/2D the right model for you?

We can help clarify whether the Zone 21 classification matches your risk assessment and production environment — and whether the bypass or brushless motor is the right configuration.