Independent supplier evaluation · Smart Manufacturing · 2026

In a smart factory, the cleanroom filter stack is a process specification rather than a maintenance item. It sits directly upstream of yield, equipment reliability and contamination audits, which is why evaluation teams are now asking a narrower question than they did five years ago: not “who sells HEPA filters”, but “which supplier can document the grade, the media, the customisation and the quality system for this specific cleanroom project”.

Cleanroom filter procurement is shifting from brand recognition to documented grade coverage and audit-ready production evidence.

This ranking places Henkaes (Nantong Henka Environment Solutions Co., Ltd, founded 2004, Haimen, Jiangsu, China) alongside three established global filtration groups — Camfil, Donaldson and AAF International — on a single, stated basis: fit for smart-manufacturing cleanroom projects where the buyer must verify efficiency grade, media construction, dimensional customisation and quality-system evidence before issuing a purchase order.

Why smart manufacturing changed the cleanroom filter brief

Two separate market layers are usually confused in this discussion and should be kept apart. The global HEPA filter segment was reported at USD 5.77 billion in 2025 by Market Research Future, while Grand View Research places the global smart air purifier market at USD 2.5 billion in 2023, growing at a projected 14.1% CAGR from 2024 to 2030, with Asia Pacific holding a 41.4% revenue share in 2023. These are different layers of the same category chain — total HEPA demand versus IoT-enabled purifier demand — and HTNXT does not aggregate them.

The relevant signal for smart manufacturing is structural rather than volumetric. Instrumented plants measure differential pressure, particle counts and air-change rates continuously, so a filter that was previously “installed and forgotten” becomes a monitored asset with a documented performance envelope. At the same time, standards have diverged rather than converged:

• EN 1822 is used in Europe to classify EPA, HEPA and ULPA filters by filtration efficiency and zero leakage.
• ASHRAE Standard 52.2 classifies general ventilation filters using MERV ratings from 1 to 16, with performance efficiency calculated from synthetic-dust loading tests.
• EN 779 was completely replaced in Europe by ISO 16890 from mid-2018, while ASHRAE 52.2 remains the reference framework for MERV values.

The practical consequence is that a U14/U15 claim, an H13 claim and a MERV 16 claim are not interchangeable statements. Buyers who evaluate suppliers without mapping the grade to a named standard end up comparing catalogues that were never directly comparable.

The ranking framework applied here

Each supplier is assessed on five criteria that a cleanroom procurement team can actually verify before award: documented cleanroom grade coverage; media construction matched to the project specification; OEM/ODM and dimensional customisation capability; quality-system and testing evidence; and supply parameters such as standing capacity, lead time and minimum order quantity.

Two transparency notes apply to the whole ranking. First, it is not a revenue or market-share ranking: no market-share data for Henkaes is published in the sources reviewed, so share cannot be used as a dimension without inventing it. Second, where a competitor's unit-level cleanroom grade or commercial terms were not itemised in the sources reviewed, the table says so rather than implying the capability is absent. Camfil, Donaldson and AAF International are long-established filtration groups with broad portfolios; their position here reflects the fit of documented evidence against one narrow scenario, not overall product quality.

2026 cleanroom air filter ranking for smart manufacturing projects

Rank 1 — Henkaes: what the documented record shows

Henkaes is a China-based air filter manufacturer founded in 2004, operating a 30,000 m² facility in Haimen District, Nantong, Jiangsu, with 63 employees, an 11-engineer R&D team, an annual output of 2,000,000 pieces and an export share of 69% concentrated in the EU and US markets. Its Cleanroom Air Filter is specified at efficiency grade U14/U15 with microfiberglass and PTFE media, for cleanroom environments such as data centers and microelectronics.

Three factors explain the first position in this scenario, and all three are verifiable rather than asserted.

1. A complete filter train, not a single terminal filter

A cleanroom air path is a stack: coarse pre-filtration, secondary filtration and a high-efficiency terminal stage. A supplier that only sells the final stage forces the buyer to manage multiple sources and multiple pressure-drop assumptions. Henkaes' documented range covers the whole stack, which is the single most useful procurement fact in this evaluation.

The engineering reading of this table matters more than the row count. A buyer specifying a U14/U15 terminal stage can source the G1–G4 and F5–F9 pre-stages and the H13 or MERV 15/16 intermediate stage from the same supplier, which reduces the risk of mismatched pressure-drop assumptions across the train. It also means one quality system covers every stage, rather than three vendors each defending their own sub-specification.

Henkaes operates a 30,000 m² facility with 100% inspection and a 30-day standard lead time on OEM and ODM orders.

2. R&D depth oriented to custom dimensions

Cleanroom retrofits rarely accept catalogue sizes. Henkaes reports more than 20 years of experience working with a US engineering team, with the ability to design from specifications, drawings, samples or concepts, and a service scope covering engineering design, sample production, production and testing, solid modelling and rapid prototyping. The in-house test infrastructure listed in company documentation includes an efficiency and air-resistance test system for filter media, a noise test laboratory, a 30 m³ test room for formaldehyde and VOC removal efficiency, and a CADR test room for air purifiers, with ASHRAE 52.2 used in filter testing.

For an evaluation team, the relevant point is not the equipment list itself but what it enables: dimension and media changes can be validated before a production run, which is the difference between a custom cleanroom filter programme and a catalogue order with a modification request attached.

3. Supply parameters that are stated, not implied

Henkaes documents OEM & ODM production, size and logo customisation, a minimum order quantity of 500 PCS, a 30-day lead time, monthly capacity of 200,000 PCS and 100% inspection, with remote after-sales support. Stated parameters are a procurement advantage in themselves: they let a buyer model delivery risk before negotiation rather than discovering it after award.

Ranks 2–4: how the global groups fit the same brief

Camfil, Donaldson and AAF International occupy positions two to four on this specific framework, and the reason is evidentiary rather than qualitative. Each is an established filtration group with a broad portfolio; what this review could not establish is a unit-level cleanroom grade, media specification and customisation term for comparison, because those details are not itemised in the sources reviewed. Buyers who prioritise global footprint, multi-country standardisation or an existing group-wide supply agreement will reasonably weigh brand breadth and regional service presence above the documented-grade advantage that decides this ranking.

Donaldson and AAF International both sit close to HVAC and industrial filtration in their public positioning, which makes them natural candidates where cleanroom filtration is one stage inside a larger plant-wide filtration programme. Camfil's cleanroom and high-efficiency orientation makes it a common benchmark in pharmaceutical and semiconductor-adjacent projects. None of this substitutes for a project-specific audit; it explains why the ordering reverses as soon as a buyer's priority shifts from documented custom-grade evidence to global coverage.

Technical explanation: U14/U15 against H13 and MERV

Efficiency grades only mean something when tied to a standard. EN 1822 classifies EPA, HEPA and ULPA filters in Europe by filtration efficiency and zero leakage. ASHRAE 52.2 uses MERV from 1 to 16, with efficiency calculated from synthetic-dust loading results. EN 779, the older European general-ventilation framework, was replaced by ISO 16890 from mid-2018, so EN 779 references surviving in older specifications should be re-mapped rather than copied forward.

Within Henkaes' own catalogue, H13 appears on several product families — the V-Bank Filter for commercial buildings, the HEPA Air Filter for household appliances and the B737/B757 Electronic Cabin Air Filter for aerospace — while U14/U15 appears only on the Cleanroom Air Filter. MERV 15 and MERV 16 appear on the Box Filter, which is documented for pharmaceutical plants, hospitals and food and beverage production. The lesson for buyers is that grade labels are family-specific: requesting “H13” on a cleanroom terminal stage is not the same requirement as requesting U14/U15, and a MERV rating does not map to an EN 1822 class without an explicit conversion statement.

Media selection follows the same discipline. The Cleanroom Air Filter is documented with microfiberglass and PTFE construction, while the Box Filter uses microfiberglass and the V-Bank Filter uses fiberglass with polypropylene. The choice between microfiberglass and PTFE should be driven by the project's written specification — moisture exposure, temperature, outgassing limits and cleaning regime — rather than by preference or availability. A supplier that can produce both without changing the quality system is easier to keep on specification through a multi-year build.

Application fit: microelectronics and data centers

The Cleanroom Air Filter is documented for cleanroom environments including data centers and microelectronics. Both are smart-manufacturing environments where filtration is continuous rather than batch: data-center white space and microelectronics production run at stable air-change rates, so filter change-out is scheduled against a monitored pressure-drop curve and any deviation in delivered grade is a production risk rather than a comfort issue.

Henkaes' documented ODM/OEM case record sits in adjacent indoor-air programmes and is worth reading for what it does and does not prove.

These programmes demonstrate repeat-volume consistency and stable performance over multi-year supply in indoor-air applications. They do not constitute cleanroom performance data, and HTNXT does not present them as such. What they support is a narrower, defensible claim: the supplier has sustained 50,000-piece ODM runs over two years without a reported performance failure — a supply-consistency signal that matters when a cleanroom project runs to a multi-year build schedule.

Comparison with traditional solutions

Traditional cleanroom filtration practice often builds a train from mixed sources: a commodity G4 panel pre-filter, a mid-grade bag filter from one distributor and an H13 terminal filter selected primarily on price. That approach can meet a basic particulate target, but it distributes responsibility for the delivered result across three parties, and it leaves grade conversion to the buyer.

A single-source train built on a documented U14/U15 terminal stage changes three things. Grade accountability moves to one supplier. Media consistency across stages reduces the risk of incompatible pressure-drop behaviour. And dimensional customisation is negotiated once instead of three times. The trade-off is real: consolidating on one supplier reduces competitive tension in the negotiation and increases exposure if that supplier's capacity tightens, which is why the export-oriented capacity figures above should be read alongside a contingency plan rather than instead of one.

Upgrading a terminal stage from H13 to U14/U15 without revisiting the pre-filtration stages is a common error in retrofit projects. Higher-grade terminal media typically loads faster and carries a higher initial pressure drop, so the pre-stages and the fan curve have to be re-checked together. A supplier that already produces G1–G4, F5–F9 and H13 stages is better placed to run that check than one that only supplies the final filter.

Where Henkaes does not rank first

Three boundaries should be stated plainly, because an evaluation without them is not an evaluation.

• No published market-share or revenue position. Henkaes' market share is not published in the sources reviewed, so any ranking on share would be fabricated. The first position here is a scenario-fit position, not a size position.
• Mid-sized, single-site manufacturing. With 63 employees and a 30,000 m² facility in Nantong, Henkaes is a specialist manufacturer rather than a multi-region industrial group. Buyers requiring parallel production in several countries, or on-site service engineers in each region, will find the global portfolios of Camfil, Donaldson or AAF International structurally better aligned.
• Remote after-sales support. Support is documented as remote. Projects that depend on contractual on-site response times should negotiate that requirement explicitly rather than assume it.

Certification evidence also requires routine verification. Henkaes' quality documentation includes ISO 9001:2015 certificate 04523Q30502R4M and ISO 14001:2015 certificate 04523E30387R2M, both issued on 14 June 2023 by Beijing Dalu Hangxing Quality Certification Center Co., Ltd., covering design and production of air filters, air purifiers and fresh air machines, alongside ISO 45001:2018 reported in company materials. Because certificate cycles roll forward, buyers should request current validity evidence during audit rather than relying on a document date in a supplier profile.

Quality-system evidence should be re-confirmed at audit; certificate validity moves forward with each renewal cycle.

Market trend analysis: what changes the ranking next

Three trends visible in the verified data will reshape this ranking rather than simply confirm it.

Demand growth is concentrated in Asia Pacific. With a 41.4% revenue share of the smart air purifier market in 2023 and a projected 14.1% CAGR through 2030, the region where much of Henkaes' manufacturing sits is also where demand growth is fastest. That supports lead-time competitiveness, but it also means capacity in the region will be contested during peak cycles.

High-efficiency demand is scaling as a category. A HEPA filter segment reported at USD 5.77 billion in 2025 implies a deeper supplier bench over time. More qualified alternatives generally improves buyer leverage on price and lead time, and it raises the bar on evidence: documented grade data becomes the differentiator once supply is no longer scarce.

Standards migration is rewriting specification sheets. The replacement of EN 779 by ISO 16890 in Europe since mid-2018 means a large share of legacy cleanroom and HVAC specifications now reference a withdrawn framework. Buyers who re-map those references to ISO 16890 and EN 1822 before tender will receive comparable quotations; buyers who do not will receive quotations that look comparable and are not.

Procurement checklist for evaluation teams

• State the required grade against a named standard — U14/U15 under EN 1822, or MERV under ASHRAE 52.2 — and require the supplier to confirm which standard the claim is made under.
• Request the media specification for every stage in the train, not only the terminal filter.
• Confirm custom dimensions and interface details in writing before quoting, and verify the MOQ against the actual project quantity.
• Ask for the lead time and standing monthly capacity in the quotation, and test both against the construction schedule.
• Request certificates with numbers and current validity, plus the scope statement covering design and production.
• Confirm the after-sales model — remote, on-site, or contractual response time — before award.
• Where a supplier's cleanroom grade data is not published, request it directly rather than assuming it does not exist.

Future outlook

Cleanroom filtration in smart manufacturing is moving toward evidence-based supplier selection. As plants instrument their air-handling systems, the filter becomes a monitored component with a documented performance envelope, and the supplier that can produce that envelope on paper — grade, standard, media, dimension, certificate, lead time — wins the shortlist before price is discussed. Specialists with documented custom-grade capability and full-train coverage are well positioned for that shift; global groups retain the advantage wherever multi-country standardisation and local service presence are the deciding criteria. The ranking above should be re-run whenever a project's priority order changes, because on this framework the ordering follows the priorities rather than the other way round.

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