Cleanroom & FFU

Fan filter units and cleanroom air systems must hold face-velocity uniformity and pressure cascades around the clock. This tag covers FFU fan selection, filter pressure matching, ISO 14644 and GMP airflow requirements, and semiconductor and pharmaceutical project cases.

Cleanroom Fan Filter Unit (FFU) Fan Selection
By longwell / September 17, 2026 / Fan Engineering Guides

Cleanroom Fan Filter Unit (FFU) Fan Selection

Selecting an FFU fan by open-air maximum flow can fail as soon as the ...

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Cleanroom & FFU: EC Fans in Semiconductor Fabs
By longwell / September 16, 2026 / Fan Engineering Guides

Cleanroom & FFU: EC Fans in Semiconductor Fabs

An FFU is not simply a fan above a filter. In a semiconductor cleanroo...

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Manometer showing negative pressure difference across a doorway
By longwell / August 21, 2026 / Fan Engineering Guides

Positive vs Negative Pressure Ventilation

Room pressure decides which way air leaks through every gap in the bui...

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Intake and exhaust fan pair, 300mm axial, for cleaning equipment
By longwell / July 1, 2026 / Engineering Case Studies

One Machine, Two Fans, Opposite Directions

Reversing an axial fan by swapping the wires does not work. Direction ...

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AC centrifugal fan, 315mm backward-curved, for a cleanroom fan filter unit
By longwell / June 6, 2026 / Engineering Case Studies

AC Centrifugal Fan for Fan Filter Units: 1854 m3/h Case Study

A HEPA filter is a wall of resistance. Getting air through one is a pr...

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High static pressure blower, 175mm backward curved, for an air purifier
By longwell / May 20, 2026 / Engineering Case Studies

515 Pa From a 175mm Fan: Air Purifier Blower Case Study

Dense filters do not need more air. They need more pressure, and that ...

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-strong-EC-centrifugal-fan-benefits-for
By longwell / December 9, 2025 / Technical Articles

EC centrifugal fan benefits for FFUs explained simply

EC centrifugal fan benefits for FFUs explained simply You get many goo...

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Centrifugal Fan Technology and Its Impact on Cleanroom Air Standards
By longwell / October 28, 2025 / Technical Articles

Centrifugal Fan Technology and Its Impact on Cleanroom Air Standards

Centrifugal fan technology helps keep cleanroom air clean and safe. Ad...

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longwell axial fans
By longwell / March 25, 2025 / Technical Articles

[Air Exchanger Ventilation Knowledge Series] Industrial Ventilation and Cleanroom Air-Exchange Requirements

The air quality in industrial production workshops and cleanrooms is c...

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