Qinghe Air Filter

Cleanroom filtration: FFU, laminar flow and contamination control

Cleanroom

A cleanroom filtration solution starts from the ISO cleanliness class, then selects FFU airflow and coverage to hold it, backed by laminar-flow workstations, biosafety cabinets, and air showers and pass boxes for material and personnel transfer. Design the air chain end-to-end rather than specifying the HEPA filter alone.

The FFU as the ceiling engine

A fan filter unit generates ceiling-down laminar airflow and is sized by airflow and coverage, not by filter dimensions alone. A 48"×48" double-motor unit delivers 4000–5000 CMH at Class 100. Efficiency runs from F8/F9 (EN 779) through H10–H14/U15 (EN 1822), with 80 °C / 80% RH operating limits. AC motors suit small fleets; EC motors suit fleets over 100 units that need central control.

Laminar flow and biosafety for the working zone

Vertical and horizontal laminar-flow cabinets deliver a clean working zone for laboratory and repair tasks. Biosafety cabinets add containment for biological work. These are point solutions layered on top of the room-level FFU ceiling, so the two must be specified together to hold the target class.

Entry and transfer control

Air showers remove particulate from personnel at entry; pass boxes transfer materials without breaking the barrier. Together with the FFU ceiling and working-zone equipment, they form the contamination-control chain. A solution that omits entry and transfer control undercuts the cleanliness the ceiling is trying to hold.

From a sourcing perspective

From a sourcing perspective, our advice is to design the air chain end-to-end rather than specifying the HEPA filter alone. We recommend starting from the cleanroom ISO class and working back to the FFU airflow and coverage, then specifying entry and transfer equipment such as air showers and pass boxes together with the ceiling FFU system. In our view, a solution that omits entry and transfer control undercuts the cleanliness the ceiling is trying to hold, so the system should be quoted as a whole, not unit by unit.

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