Delfin MTL 4535
- ATEX Zone 22 productions with long hose runs or high concurrency
- Collection of dense or heavy dust where 318 m³/h is insufficient
- Medium-sized wood, metal and chemical productions with space constraints
- Continuous operation in process plants with fluctuating load
- Upgrade from MTL 4534 when customer demand grows without needing a bigger container
- 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 MTL 4535
The Delfin MTL 4535 is the more powerful sibling of the MTL 4534: the same compact 45-litre cabinet and the same stainless-steel container, but with 4 kW power and 420 m³/h airflow instead of 318. It targets productions where greater air volume is decisive — long hose runs, multiple workstations or denser dust types — while footprint and manoeuvrability remain identical to the MTL 4534. Self-certified per EN 17348:2022 in category 3D.
Applications
- ATEX Zone 22 productions with long hose runs or high concurrency
- Collection of dense or heavy dust where 318 m³/h is insufficient
- Medium-sized wood, metal and chemical productions with space constraints
- Continuous operation in process plants with fluctuating load
- Upgrade from MTL 4534 when customer demand grows without needing a bigger container
Technical specifications
| ATEX marking | II 3D Ex h tc IIIC T80°C (Int)/T165°C (Ext) Dc |
|---|---|
| Internal / external zone | 22 / 22 |
| Motor type | Sidekanalblæser, 3-faset (trifase) |
| Duty cycle | Continuous |
| Airflow | 420 m³/h |
| Vacuum | 314 mbar (3200 mmH₂O) |
| Container | 45 L |
| Sound pressure | 69 dB(A) |
| Filter class | H class |
| Filter type | Klasse H HEPA, 27.100 cm² filterflade, H14-efficiens (99,995 % MPPS, EN 1822-5) |
| Primary filter | Stjerne/taske antistatisk polyester M, 20.000-420 cm²-mm |
| Collection system | Plastic bag |
| Material | Lakeret stål med rustfri stålbeholder og ABS-tilbehørskurv |
| IP class | IP65 |
| Power | 4.0 kW |
| Current | 8.4 A |
| Voltage | 400 V / 50 Hz / 3~ |
| Inlet | Ø 80 mm |
| Dimensions (L × W × H) | 580 x 930 x 1160 mm |
| Weight | 90 kg |
Questions and answers
Is it ATEX-certified or self-certified?
It is self-certified by Delfin per EN 17348:2022 in category 3D. For category 3, the ATEX Directive permits manufacturer self-certification, provided the requirements of the harmonised standard are met. The marking is II 3D Ex h tc IIIC T80°C (Int)/T165°C (Ext) Dc.
Why are two vacuum values shown on the datasheet?
The model has a pressure relief valve fitted as standard. The valve admits false air at a set vacuum (2600 mmH²O) and thereby prevents the side-channel blower from being overloaded by blocked filters or a closed hose. The higher value (3200 mmH²O) is the theoretical maximum vacuum without valve activation. Both values are indicative and measured in new condition.
How is the dust collected — is there a bag?
The dust is collected in an open antistatic plastic bag placed in the container. The bag is held in place by a vacuum kit fitted at commissioning, which uses the container vacuum to press the bag against the container wall. This prevents the bag from collapsing or being drawn into the filter during operation.
Is it certified for Zone 21 or Zone 20?
No. The model is categorised as 3D Dc, which only covers Zone 22. For Zone 21 or internal Zone 20, a 1/2D or 1/3D model must be used — for example the Delfin MTL 301 1/3D, MTL 201 1/2D or DM2 EL 1/2D LP. Contact Particulair if you are unsure which zone classification your production requires.
Can it run continuously for 8-16 hours?
Yes. The side-channel blower is oil-free and has long service life under continuous operation — that is the reason the technology is preferred on the MTL/DG range over bypass or brushless motors. The pressure relief valve protects against overload from filter blockage, and the motor is rated for continuous duty (S1).
What is the difference between the MTL 4534 and MTL 4535?
The cabinet, container (45 L), materials (painted steel with stainless-steel container and ABS accessory basket) and dimensions are identical. The difference lies in the motor: the MTL 4534 has 3 kW with 318 m³/h airflow, while the MTL 4535 has 4 kW with 420 m³/h. The MTL 4535 also has a slightly lower valve-opening vacuum (2600 mmH²O vs 2700). Overall, the MTL 4535 is chosen where longer hose runs, more workstations or denser dust demand more air movement without a larger container.