Delfin ZFR EV 420 Z22 K07

A deduster (centrifugal-fan based particle collector) is a stationary dust collector designed to capture airborne particles via high airflow at relatively low static vacuum. Where a mobile industrial vacuum delivers 100-300 m³/h at 200-300 mbar (designed to draw through a long hose into a bin on the floor), the ZFR EV 420 K07 delivers 1,000 m³/h at just 18 mbar (designed to capture diffuse particles at the source via extraction arm or central piping). These are two different working principles: point collection versus volume capture. The deduster's strength is continuous, automatic operation with large airflow.

The model is intended for dry combustible dust and fine suspended particles -- typically metallic grinding dust, polymer dust from plastics processing, organic process powders such as flour and spices, and fine chemicals in powder form. The filter class is L (IEC 60335-2-69) with HEPA H14 final filter (EN 1822-5), so the exhaust meets even stringent workplace requirements. The model is NOT designed for wet or sticky materials, large mechanical chips, or reactive metallic dust (all of these require specialised models -- wet variants, heavier chassis or INERT liquid bath).

The marking is 'II 3D Ex h IIIC T80°C (int) / T135°C (ext) Dc' -- group II (above-ground industry), category 3 for dust (Zone 22 external, EPL Dc). The type of protection is 'h' (constructive safety per EN ISO 80079-37) for dust group IIIC (all dust effect groups including conductive). Internal surface temperature is limited to 80°C, external to 135°C -- important to ensure that dust contacting the enclosure does not ignite. The centrifugal fan and control box are both 'Ex tb Dust Tight Certified', and the entire unit is performance-tested to EN 17348:2022, the harmonised European standard for industrial vacuums in ATEX zones.

Both are valid, and the choice depends on the scenario. With an articulated extraction arm (TA.0177.0000 oe150 or TA.0511.0000 oe200, 3,000 mm reach) the model becomes a flexible source-capture station -- ideal for welding fume extraction, grinding workstations or bag emptying. Without an arm the deduster can be connected directly to a machine or process via the 100 mm suction inlet -- typically a CNC, grinder or mixer with fixed suction tubing. Tubo-flex reductions (SL.6883.0200 from oe200/100) allow adaptation to other hose dimensions. Earth grounding (MT) is included as standard.

The two blower types solve different problems. A side-channel blower delivers high vacuum (200-300 mbar) at moderate airflow (200-400 m³/h) -- ideal for a mobile vacuum with a long hose. A centrifugal fan delivers the opposite: high airflow (1,000-3,500 m³/h) at low vacuum (15-40 mbar) -- ideal for source capture and central suction where the extraction arm or piping has low pressure drop. If you try to capture diffuse particles at a welding workstation with a side-channel blower, the concentration of air movement will be too small. If you try to draw through a long hose into a bin with a centrifugal fan, the vacuum will be too low. Choose type by application, not by general preference.

The primary filter is L class per IEC 60335-2-69 -- 'low risk' category for dust with MAK value above 1 mg/m³ (or rather: not-particularly-hazardous dust). It is the least restrictive of the three vacuum cleaner classes (L, M, H). BUT the important thing is that the final filter is HEPA H14 per EN 1822-5 -- 99.995 % efficiency at MPPS (Most Penetrating Particle Size, ca. 0.3 micrometre). This means that regardless of what dust type the primary filter retains, the final exhaust will be clean at H level. The deduster's overall capability is therefore equivalent to an H-class vacuum -- the L-class rating on the primary filter is part of the construction specification, not an output requirement.