Delfin CUBE 20 K4 PN Z22

It is a consequence of the difference in pulse-jet cleaning timing. The ACD version's 'automatic alternating air washing system' fires pulses in an even, rotating pattern that is often less audible to the operator. The Z22 version's 'automatic filter cleaning with operated air during suction' is ATEX-compatibly timed with the suction-point vacuum, meaning pulses can overlap with phases where the motor is already producing more sound due to load variation. The difference is 2 dB(A) -- noticeable but not significant. Both models remain below the occupational exposure limit of 80 dB(A) for 8-hour exposure. If noise level is critical, a separate technical room or sound-absorbing cabinet that reduces 10-15 dB(A) is recommended.

No -- constructively it is NOT certified for Zone 21 (II 2D category). The Z22 model is certified category 3D which is the lowest ATEX dust category, where explosive atmosphere occurs briefly or rarely during normal operation. Zone 21 (category 2D) requires a higher level of protection where explosive atmosphere occurs periodically during normal operation -- this demands heavier construction, notified third-party certification, and additional explosion dampening. For Zone 21 installations you must choose a II 2D model (such as the MTL 202 1/2D LP or a specially ordered Z21 deduster). It is important to note: you cannot upgrade a Z22 deduster to Z21 by retrofitting -- certification class is determined by the underlying construction.

Four things, beyond the ACD version's standard requirements. (1) Explosivity assessment documented by the installation responsible party for zoning (a so-called 'EX document' in Denmark, previously 'Explosion Protection Document'). (2) Installation must be performed by an ATEX-qualified technician with documented competence -- in Denmark typically an installer with ATEX course from DBI or equivalent. (3) Annual inspection of the unit documented in an ATEX inspection report per EN 60079-17 -- typically a technical check of continuity, isolation and wear. (4) Secure storage of CE declaration, nameplate photo and EN 17348:2022 compliance documentation in the unit's operating log. These requirements are not physical items on the unit, but administrative discipline around installation.

Standard delivery time from Delfin Italy is 8-14 weeks for standard configuration (painted steel, inox control box, standard cartridge filters). With option selections -- e.g. XXX full AISI 304 construction, PTFE ANT filter, or LOC REM remote control -- delivery typically extends by 2-4 weeks. Freight from Italy to Denmark takes 3-7 days depending on carrier. Installation and commissioning phase at customer is typically 1-3 days, for mechanical connection, electrical hookup and functional test. So from order to operational, 10-18 weeks should be allowed. If delivery is urgent, Delfin can sometimes offer in-stock models at their Italian factory -- contact sales@particulair.com for current stock status.

Upon delivery of the CUBE 20 K4 PN Z22 five documents accompany. (1) CE Declaration of Conformity with reference to the ATEX directive 2014/34/EU, Machinery directive 2006/42/EC and Low Voltage directive 2014/35/EU. (2) ATEX nameplate with marking 'II 3D Ex h IIIC T80°C (int) / T135°C (ext) Dc' -- must be visibly affixed to the deduster throughout its lifetime. (3) Operating manual and safety instructions in Danish (and typically English/German/Italian). (4) EN 17348:2022 performance test documentation on request. (5) Electrical schematics and spare parts list. All documents must be retained in the unit's operating log throughout its lifetime -- during annual inspection it must be verified that the nameplate is legible and documentation is accessible.

Yes -- typically 2,500-4,000 EUR extra for the Z22 version (compare price list: CUBE 20 K4 PN ACD 10,975 EUR versus CUBE 20 K4 PN Z22 13,810 EUR -- difference 2,835 EUR or ca. 26 %). The surcharge covers Ex-certified motor, dust-tight testing and certification of the enclosure, stainless steel AISI 304 electrical panel, documentation and nameplate marking, plus the manufacturer's compliance work per the ATEX directive. If your area is actually classified as Zone 22, the Z22 version is legally necessary and the surcharge cannot be avoided. If the area is borderline classification (could be ACD or Zone 22 depending on risk analysis), it can pay to commission a risk analysis from an ATEX consultant before deciding. A wrong ACD installation in a Zone 22 zone is a serious violation of the ATEX directive.