Engineering Reference Case Profile · New-Build Logic Fab FFU Fit-Out

22,000 FFU at ISO Class 5 · Logic Fab Fit-Out

A composite reference case based on representative new-build semiconductor logic fab FFU fit-out projects — supplying 22,000 EC plug FFU at ISO 14644 Class 5 face-velocity uniformity, ULPA U15 filter compatibility, EMC Class B for lithography, and 14-week PO-to-fab-floor delivery to match compressed construction schedule.

Project size: 22,000 FFU at ISO Class 5 · 25 MW IT-equivalent fab fit-out Reference period: Composite reference · 2024–2025 build pattern Geography: Asia-Pacific logic fab segment

About this case profile: This is an anonymized composite reference case based on representative LONGWELL platform deployments in the Semiconductor · Class 5 Cleanroom segment. It illustrates the engineering challenge, solution architecture, and measurable outcomes typical of projects in this class. Performance numbers reflect LONGWELL platform validated specs plus industry-standard improvement deltas, not a specific named customer claim. Real customer references are available under NDA on project qualification (sales@longwellfans.com).

1 · Challenge

Fab fit-out construction schedule: 14 weeks from FFU spec lock to cleanroom commissioning hand-over.
ebm-papst RadiPac FFU lead time of 16–22 weeks would have blocked the cleanroom commissioning critical path.
ISO 14644 Class 5 face-velocity uniformity within ±18% across the FFU face (cleanroom integrity requirement).
ULPA U15 (99.9995% at 0.12 μm MPPS) filter pressure compatibility.
EMC Class B conducted emissions for ASML EUV / Nikon DUV lithography tool acceptance (≥40 dB margin to tool threshold).
22,000 identical FFU procurement quantum — fab-scale ramp capability.

2 · Solution Architecture

22,000 FFU modules on 600×600 mm ceiling-grid lay-down across logic-fab cleanroom + sub-fab return. Each FFU includes pre-fitted ULPA U15 filter, plenum-ring + EC plug fan + diffuser + control board. ISO Class 5 face-velocity uniformity within ±18%, validated per shipment via Pitot-tube grid measurement at LONGWELL acceptance.

Bill of materials

LONGWELL SKU	Type	Qty	Key spec
LWBE3G-355-FFU	EC backward-curved FFU module	22,000 units	Ø355 mm, 0.45 m/s ±18% face velocity uniformity, ULPA U15/U16 compat, EMC Class B per EN 55014, 53 dB(A) full / 39 dB(A) at 50%

3 · Modelled Outcomes — Typical Range

How to read these figures: the values below are modelled for this composite scenario. They are a planning range, not measured results from one named project. Verified data from real deployments is in Section 6.

Total FFU deployed

22,000

across logic-fab cleanroom

ISO Class 5 first-pass certification

Yes

no re-spec required

EMC Class B verified per shipment

100%

via TÜV test reports

Lead time PO → fab floor

14 weeks

vs 16–22 wk ebm-papst

Production cadence

1,700 FFU/week

after week 4 tooling lock

CapEx delta vs ebm-papst RadiPac

−48%

at fab-scale volume

4 · Implementation Timeline

Week 0Spec lock + master PO for 22,000 FFU

Week 1–3Tooling lock + first 1,000-unit qualification batch

Week 4Qualification batch acceptance + EMC Class B verification at fab

Week 5–13Production at 1,700 FFU/week, weekly sea-freight

Week 14Cleanroom commissioning hand-over

5 · Engineering Lessons

Fab fit-out construction schedule was the binding constraint, not ebm-papst brand recognition. Saving 4 weeks of fab-floor idle time was worth more than the η delta.
EMC Class B verification per shipment (not as one-time type test) was procurement-mandatory — lithography tool acceptance test runs adjacent to FFU bank.
Production cadence of 1,700 FFU/week required parallel production line allocation across Yuyao + Hai Phong factories. Ebm-papst would have queued against multiple semi-fab + DC + HVAC customers.
ISO Class 5 first-pass certification (no re-spec required) avoided a re-test and delayed-commissioning cycle.
CapEx released by the 48% delta on 22,000 FFU was redirected to additional in-fab metrology and AMHS upgrades.

6 · Verified Project Evidence

Everything below is drawn from actual project correspondence. Model numbers, duty points and certification basis are stated as they occurred. Customer names are withheld; no pricing is published.

Singapore — semiconductor equipment OEM, fan replacement

EC backward-curved · delivered

Certification was the gate, not performance. The programme required ETL and ErP conformity evidence before the fan could be designed in.
Supplied: EC backward-curved fans matched to the incumbent on aerodynamic duty and mounting interface, with the compliance pack issued alongside the selection.

Russia — cleanroom FFU builder

EC backward-curved with RS485 · delivered

Supplied: EC backward-curved fans with an RS485 centralised control box so a filter-fan array can be addressed and balanced as one system.
The compatibility question that decided it: whether the inlet ring geometry interchanged with the European unit already designed in. Full structural drawings of fan and inlet ring were issued with a dimension-by-dimension comparison. A repeat order for 240 units followed.

Germany — semiconductor and PV thermal-processing equipment

Cross-flow and EC centrifugal · delivered

Qualification method: the customer tested candidate fans in their own machine locally rather than accepting catalogue data — the right approach when the fan sits in a thermal process.
Both cross-flow and EC backward-curved centrifugal platforms were supplied for that comparison.

CE EMC Certificate of Conformity for LONGWELL LWBE-AO series centrifugal fans — CE EMC certificate of conformity, Directive 2014/30/EU Annex II, covering the LWBE250/280/315/355/400/450-AO centrifugal fan range against EN 55014-1, EN 55014-2 and EN IEC 61000-3-2/-3.

CE Certificate of Conformity for LONGWELL centrifugal fans LWBE250-AO to LWBE450-AO under EMC Directive 2014/30/EU — CE Certificate of Conformity under the EMC Directive 2014/30/EU for the LWBE250-AO to LWBE450-AO centrifugal fan range, tested to EN 55014-1, EN 55014-2, EN IEC 61000-3-2 and EN 61000-3-3. Cleanroom and fab-scale projects qualify the fan on documents before they qualify it on performance — this is part of the pack issued with the selection.

Fan performance figures are quoted from LONGWELL controlled datasheets and are tested per AMCA 210/211 methods; third-party reports available on request. EC versus AC energy saving is approximately 30%, higher under strongly varying load — confirm against your own load profile. Final selection must be confirmed against the actual duty point (airflow / static pressure / voltage / control method) and project validation.

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