Industrial vacuum cleaners split along four axes — single-phase vs three-phase power, dry vs wet media, mobile vs fixed, and standard vs ATEX/IECEx-rated — and the combination is dictated by dust class, ignition risk, and continuous-shift duty rather than brand preference [S1][S2].
On DirectIndustry's metallurgical-industry filter, 10 manufacturers and 77 catalog models were listed, with Depureco Industrial Vacuums alone covering 56 entries, showing how fragmented the supply base is once you cross from general cleaning into heavy-industry recovery [S2]. Trelawny's KAV 30 series, a 30-litre single-phase mobile dry unit, sits at the opposite end: ATEX-certified for Gas Zone 1 and Dust Zone 21, supplied with a conductive tool kit, antistatic float assembly, and an optional Type H (high-hazard) variant for dust class H applications [S1].
Power-Source Classes: Single-Phase, Three-Phase, and Pneumatic
Single-phase 220 V units are the default for workshops, bakeries, and light-manufacturing cleaning, with Chinese OEM listings on Made-in-China clustering 110–220 V HEPA models in the US$28–1,300 export range and MOQ between 1 and 780 sets [S7].
Three-phase units dominate metalworking and metallurgical recovery: Depureco's MHD 150 lists 12.5 kW, a 160 L vessel, and a lobe-pump suction head with a built-in vacuum gauge for clogging detection [S2]. Depureco's SKID hopper-loader runs 4–24 kW on 550 / 1,100 / 2,200 L vessels, sized for 24/7 chip-and-dust duty [S2]. DU-PUY's CHIPVAC 200 stacks three single-phase motors with an optional 3-stage series head to push airflow to 540 m³/h on oil-and-chip recovery [S2]. For the deep end of the catalogue — high-temperature, spark-prone, or explosive atmospheres — pneumatic-driven units remove the electric ignition source entirely; they are the form most often specified for Zone 1/21 dust collection on handheld scaling tools such as Trelawny's TVS® [S1].
Dust Class, Filtration, and the ATEX Question
ATEX category 2 (Zone 1 gas, Zone 21 dust) certification on the KAV 30 carries an earth-path continuity certificate per machine and pairs the vacuum with a fully conductive accessory kit, stainless canister, and conductive braked castors to bleed off static charge [S1].
Filtration is graded by dust class, with L (light), M (medium), and H (high-hazard) tiers — KAV 30's optional Type H variant ships with a filtration test certificate and is matched to carcinogenic or pathogen-bearing dusts [S1]. HEPA media is the separate dimension layered on top: Delfin Industrial catalogues HEPA options alongside its OSHA-approved, NRTL-certified explosion-proof line for combustible-dust environments [S3]. Filter-cleaning mechanism matters because it sets the real-world duty cycle: Depureco's M65/100 (3,900 W, 65 L, 570 m³/h) uses a manual side-lever shake, while their iPulse M-1635 Safe (1,600 W) uses a DDM pressure-difference electronic pulse system that pulses only when the filter delta-P crosses threshold, holding suction constant in class M dust [S2].
Dry vs Wet, Continuous vs Intermittent
On the metallurgical filter, dry models outnumber wet models roughly 46 to 13, reflecting that swarf, grinding dust, and powder dominate metalworking waste streams [S2].
Wet-and-dry capability is built in by adding an antistatic float assembly to shut off suction when the vessel fills — the KAV 30 wet/dry kit swaps the standard filter for Part No. 303.1050/AS and adds a conductive wet pickup head [S1]. DU-PUY's SILOVAC 100 T (3.3 kW, 100 L, 370 m³/h) is the classic coolant-and-oil separator: a built-in mechanical cleaning lever shakes the filter vertically so suction does not decay in saturated air [S2]. Delfin's FLIO VACCUM 1 (2.4 kW, 0.208 m³, 120 kg) is a hybrid coolant-tank skimmer — it vacuums and filters CNC emulsion sumps and pumps the cleaned fluid back in one pass, illustrating how "vacuum cleaner" blurs into process equipment once the duty is continuous [S2][S3].
Capacity, Airflow, and Power — The Real Spec Map
Capacity alone is misleading because two 100 L units can sit on either side of a 5× airflow gap; pair vessel size with motor power and measured airflow before comparing price [S2].
Across the metallurgical catalogue, a clear ladder emerges: light mobile dry (e.g. KAV 30 at 30 L) → mid-range workshop (Depureco M65/100 at 65 L / 570 m³/h) → chip-and-coolant separator (SILOVAC 100 T, 100 L / 370 m³/h) → CNC tank skimmer (FLIO VACCUM 1, 208 L) → high-flow metallurgical recovery (MHD 150 at 160 L with 12.5 kW lobe pump) → 24/7 hopper loader (SKID at 550–2,200 L with 4–24 kW) [S1][S2]. The DHV hopper-mounted lobe-pump series extends the high-flow band to 800–1,000 m³/h at 22–45 W-class motors, marketed for "continuous, heavy duty use" in foundry and mill conditions [S2].
Industry Fit and Selection Boundaries
Industrial vacuums are FOR plants with continuous dust or swarf generation — metalworking (MHD 150, CHIPVAC 200), additive manufacturing powder recovery, CNC chip handling, combustible-dust processes (pharma, food, plastic), and ATEX Zone 1/21 surface-prep pairings with pneumatic scaling tools [S1][S2][S3].
They are NOT a substitute for fixed ducted extraction on high-tonnage foundry or cement lines, where centralized vacuum systems handle thousands of m³/h across multiple workstations [S3]. A 30 L mobile single-phase unit cannot keep up with a CNC cell running 200 kg of chip load per shift; conversely, a 1,100 L three-phase hopper loader is overkill and a trip hazard in a cleanroom or a bakery. For cleanroom and pharma integration, the cleaner-room boundaries and filter-tier rules are covered in a separate cleanroom spec map, and particulate emission at the discharge side ties directly into air pollution control selection. For light-industry buyers comparing export catalogues, Chinese OEM HEPA units on Made-in-China land in the US$28–1,300 FOB band with MOQ from 1 to 780 sets, useful as a price-floor reference but not a safety spec reference [S7].
Standards, Certifications, and Failure Modes
ATEX 2014/34/EU category 2 governs Zone 1 gas / Zone 21 dust equipment in the EU; OSHA/NRTL certification is the US equivalent for explosion-proof ratings, and ISO 9001 plus NFPA compliance is what Delfin cites across its 140-model catalogue [S1][S3].
Common failure modes — and the spec clauses that prevent them — are filter clogging (spec a DDM pulse-clean system or oversized filter area), static ignition in combustible dust (spec a fully conductive accessory kit plus earth-path continuity certificate), vessel overfill on wet pickup (spec an antistatic float shut-off), and suction loss on long hose runs (spec a vacuum gauge on the head and oversize the blower by 20%). On the supplier side, the industrial vacuum cleaner spec map provides a side-by-side decision view, while buyers mapping metallurgical-vendor options against vacuum pump and vacuum gauge requirements can cross-check the underlying suction-train components. Trackable signals for the next planning window: ATEX category 2 single-phase units below 40 L with Type H variant availability, HEPA H13/H14 retention data published on the datasheet (not just "HEPA" in marketing copy), and DDM pulse-cleaning claimed in writing rather than as a side-lever accessory.