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 · Measured Outcomes

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) saved an estimated $1.8 M in re-test + delayed-commissioning cost.
48% CapEx delta on 22,000 FFU = approximately $9 M saving, redirected to additional in-fab metrology and AMHS upgrades.

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