Combustible dust, abrasive particulate, sticky organic dust, submicron pharma fines — every dust-extraction duty is different, and a fan that runs 5 years in one application fails in 5 months in another. We build dust-handling fans across three duty families that share one engineering response: dust collection downstream of bag filters and cyclones, air-filtration extraction across particulate-laden ducts, and pollution-control OEM supply for bag-filter, scrubber and ESP integrators.
A dust-extraction fan moves particulate-laden air through a filter train — pulling dust off the source, holding the duct under negative pressure, and discharging clean air. The same engineering applies whether you collect at the hood, filter a process duct, or buy the fan as a sub-package for a pollution-control system.
Negative-pressure extraction at the source — hoods over grinding stations, conveyor transfer points, mixers and mills. The fan sits clean-side of the filter (most common) or dirty-side (harder duty, heavy inlet loading).
Extraction across a process duct or building system where particulate must be removed to protect downstream equipment — lower loading than collection, but continuous duty and tight pressure-drop tolerance.
Pollution-control OEM supply: we deliver the engineered fan as a sub-package to bag-house, cyclone, scrubber and ESP builders — interface documented up front, ready to mate.
Abrasive, sticky and combustible dust drive the three failure modes that destroy extraction fans. Design for the dust you actually have, and the fan runs 5+ years between overhauls. Specify it for clean air, and an abrasive or combustible duty fails it in 5–12 months.
Cement dust, foundry sand and fly ash at high dust loads — all scour the blades and volute on dirty-side designs until the rotor goes out of balance.
How we engineer it outHard-faced (chrome-carbide) blades, AR400 bolted-in wear plates on the throat and outlet, and rejection geometry — radial-tipped wheels that don't trap dust in the blade root.
Sticky organic dust — food, biomass, wood — builds up on the blade. The mass redistribution drives vibration; eventually the imbalance trips the protection or breaks the shaft.
How we engineer it outRadial-tipped self-cleaning impeller geometry, sloped blade faces to encourage shedding, and in-place water-wash cycles where the dust composition allows.
Combustible dust plus an ignition source — static spark, hot bearing, metal-on-metal contact — is an explosion. This is the ATEX problem, and it is the default risk for pharma, food, wood, biomass and metallic dust.
How we engineer it outAluminium-alloy or bronze rub rings to prevent ferrous-on-ferrous contact, bonded earthing throughout, anti-static coatings, T-class bearing-temperature control, and ATEX Zone 22 self-declaration per 2014/34/EU.
We don't sell a catalogue near-fit. The fan is engineered to your dust type, loading, pressure-drop range and area classification — made to order, not off a shelf.
No catalogue fan forced onto your spec. Your operating point is engineered across the clean-filter and loaded-filter range onto the best-efficiency region of the selected wheel — then verified on the 200 HP VFD test rig before dispatch.
| Parameter | Standard | On application |
|---|---|---|
| Volume flow | up to 2,00,000 CMH | higher on enquiry |
| Static pressure | up to 1,000 mmWC | up to 2,000 mmWC for high-resistance filter trains |
| Operating temperature | ambient to 150 °C | up to 350 °C for hot-process dust |
| Inlet dust loading | clean-side (post-filter) or dirty-side high-dust duty; loading limits shared on enquiry | higher with enhanced wear protection |
| Drive power | up to 400 HP | higher with custom motor sourcing |
| Speed | 600–1,800 RPM typical | per duty + sound limits |
| Balance quality | ISO 21940 G6.3 | G2.5 / G1.0 on application |
| Bearing life (design target) | L10h ≥ 40,000 h continuous | longer L10 on application |
The envelope above covers the great majority of dust-extraction duty. Static pressure runs up to 1,000 mmWC on standard filter trains and up to 2,000 mmWC on high-resistance ones; inlet loading is duty-dependent — low on clean-side fans downstream of the filter, and heavy on dirty-side service. ATEX is Zone 22 (Cat 3D) self-declared as standard; Zone 21 (Cat 2D) is available on application via a Notified-Body partner. For duty beyond the envelope we engineer to spec and quote on enquiry.
The same engineering language carries from your enquiry to the GA drawing to the nameplate — expressed in the standard AMCA conventions.
| Specification field | Options |
|---|---|
| Arrangement (AMCA 99) | Arr. 1 (overhung, fan bearings) / Arr. 4 (direct, motor on base) / Arr. 8 (overhung on common base) / Arr. 9 (overhung, motor side) / Arr. 10 (overhung, motor inside base) — selected by drive, access and dust ingress. |
| Width / inlet | SWSI (single width, single inlet) default for dust duty; DWDI (double width, double inlet) for high flow at moderate pressure. |
| Wheel type | Radial-tipped self-cleaning (default for dust) / straight-radial (when sticky build-up dominates) / backward-curved (clean post-filter discharge, high-efficiency duty). |
| Class (by pressure / outlet velocity) | Class I / II / III selected from the duty point on the pressure-vs-outlet-velocity limits; higher class = heavier construction for higher pressure and tip speed. |
| Materials of construction | MS with AR400 bolted wear plates (cement, fly ash) / 4140 + chrome-carbide wheel (foundry sand) / 316L SS (chemical, pharma) / 304 SS food-grade (flour, sugar, spices) / aluminium impeller (wood, biomass) / Hastelloy or duplex for corrosive dust. |
| ATEX scope | Zone 22 self-declared (Cat 3D) per 2014/34/EU as standard for combustible dust — aluminium impeller, bronze rub rings, bonded earthing, anti-static coatings, T-class bearing control. Zone 21 (Cat 2D) on application via Notified-Body partner. |
| Drive | Direct-coupled / V-belt / VFD (default for filter-loading control). Drive up to 400 HP across the envelope; speed typically 600-1,800 RPM. |
| Accessories & acoustic scope | VFD or damper control; bolted-in AR400 wear plates with hinged access doors; labyrinth + lip bearing seals against dust ingress; inlet and outlet silencers with acoustic-lagged casing (down to <75 dB(A)); drain and inspection doors. |
Every job's performance is verified at our works on the 200 HP VFD test rig, to the AMCA 210 / ISO 5801 method, before dispatch.
Raw-mill bag filter, kiln dedusting, packing-plant extraction.
Moulding-station extraction, shake-out dedusting, melting-fume capture.
Granulation, tablet coating, dust-tight dispensing — ATEX Zone 22.
Flour mills, spice grinding, sugar handling, dairy spray dryers — ATEX Zone 22 for combustible food dust.
Sinter-plant dedusting and fume extraction over molten metal.
Sawmill extraction, MDF press dedusting, biomass boiler ash.
Crusher dedusting and conveyor-transfer dust extraction.
Fans supplied as a sub-package to bag-filter, cyclone, scrubber and ESP builders — interface documented up front, 45 duty types engineered. Tell us yours.
What our marks mean, in the words that survive an audit.
Tested to the AMCA 210 / ISO 5801 method, in-house on our 200 HP VFD rig. Tested-to-method — not AMCA-certified.
ISO 9001:2015 — third-party certified. Our only third-party certification.
Self-declared per 2006/42/EC + 2014/35/EU (Module A). A self-declaration, not a notified-body certificate.
Self-declared, Zone 2/22, Category 3, per 2014/34/EU, where the area classification calls for it.
Designed and built to API 673 as project-specific scope.
ASME Sec IX qualified welders + WPS for every joint.
ISO 21940 — G6.3 minimum, G2.5 / G1.0 on application.
ISO 20816 evaluation; ISO 14694 for fan-specific limits.
| Stage | Standard duty | API-673 / engineered |
|---|---|---|
| Offer / quotation | 3 working days — always | 7–10 working days |
| GA drawing for approval | 2–3 weeks from PO | 3–4 weeks from PO |
| Manufacture + balance + paint | 6–10 weeks | 10–14 weeks |
| Performance test + witnessed FAT | ~1 week | 1–2 weeks |
| Order-to-dispatch (total) | 9–14 weeks | 14–20 weeks |
Shutdown-driven replacements: we have shipped fans within 6 weeks of a clean PO. Tell us your shutdown window and we commit to a dated plan.
The same engineering, viewed three ways — by fan family, by duty, and by industry. Follow the cross-references.
No model numbers needed. Give us the operating conditions — flow, static, gas temperature, composition, particulate, and any tender standard — and our application engineers size the fan and quote it. Attach a spec or GA if you have one.
+91 90110 09155 · mihir.jitamitra@gmail.com