Vertical Laminar Flow Clean Bench for Cleanroom Assembly

What is the Vertical Laminar Flow Clean Bench for Cleanroom Assembly?

A vertical laminar flow clean bench supplies HEPA-filtered air downward from the top of the work zone. In cleanrooms it is used for component assembly and handling where parts are worked on from above.

Overview

The unit has a fan filter module in the top, a 1200 × 600 mm or larger HEPA filter and a perforated stainless steel work surface through which air returns or is exhausted. Down-flow at 0.3–0.45 m/s creates ISO 5 conditions across the work surface, with a glass or acrylic front shield adjustable in height to reduce turbulence. Work-zone widths typically run 900, 1200 or 1500 mm with work heights of 750–850 mm. Noise stays below 62 dB(A) at 0.4 m/s, and the LED luminance exceeds 500 lux at the working surface. The bench is made of 304 stainless steel or powder-coated steel with smooth, sealed seams. A digital airflow display warns when velocity falls below set limits.

How does it work?

A cleanroom clean bench draws air from the room through a prefilter, pressurizes it in a plenum and forces it through a HEPA or ULPA filter so that unidirectional (laminar) air flows over the work surface at 0.3–0.5 m/s. In a horizontal design the air passes from the rear toward the operator, while in a vertical design it descends from the ceiling of the work zone. The moving air sweeps particles generated by operators and products away from the work area, maintaining ISO Class 5 (Class 100) air at the working height. Because the air exits into the room, these benches protect the product, not the operator. Stainless steel or powder-coated steel work surfaces, fluorescent LED lighting, and an airflow controller complete the unit. For cleanrooms, benches often use low-particle materials and sealed cable penetrations.

What are the key features?

• Top-mounted HEPA fan filter module
• Down-flow at 0.3–0.45 m/s over perforated work surface
• Height-adjustable glass front shield
• LED lighting above 500 lux at the work surface
• Digital airflow display with low-velocity alarm
• 304 stainless steel or powder-coated steel body

What are the technical specifications?

A typical vertical laminar flow clean bench for cleanroom assembly configuration offers airflow direction of Vertical (downward), air velocity of 0.3–0.45 m/s, cleanliness class of ISO 5 (Class 100), filter grade of H14 HEPA, ≥ 99.995 % at MPPS, work-zone width of 900 / 1200 / 1500 mm and work height of 750–850 mm. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Vertical Laminar Flow Clean Bench for Cleanroom Assembly is used in component assembly, pharmaceutical sample handling, medical-device packaging and electronics inspection. Across the wider Clean Benches class, laboratories also deploy it for electronics assembly, optical component inspection and medical-device assembly.

Which standards and certifications apply?

Relevant standards and methods include ISO 14644-1 (cleanroom classification), ISO 14644-3 (test methods), ISO 14644-4 (design and construction), IEST-RP-CC002 (unidirectional flow devices), JG/T 292 (clean bench), GB/T 25915.1 and EN 1822 (HEPA and ULPA filters). Certification candidates for this model are CE and ISO 9001 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Place the bench away from doors and supply diffusers, since room drafts above 0.1 m/s can disturb the laminar flow. Commission with a filter leak test, airflow velocity survey and particle count to ISO 14644-3. Replace prefilters every 3–6 months and HEPA filters when face velocity cannot be restored at maximum fan speed, typically every 3–5 years. Wipe surfaces with isopropanol or a compatible disinfectant, working from clean to dirty. Because benches recirculate room air, they must not be used with hazardous chemicals, pathogens or cytotoxics. Record airflow and particle checks in the cleanroom log for regulatory audits.

How do I select the right Vertical Laminar Flow Clean Bench for Cleanroom Assembly?

Choose a vertical flow bench when work is done over the product and operators reach into the stream from the front. It is usually preferred for assembly and handling. RFQ: work-zone width, filter grade, surface material, ESD requirement and noise limit.

How does it compare with other Clean Benches variants?

Choose by the direction of airflow, the size of the work area and the product being handled. Vertical flow suits assembly of components where operators work over the product, while horizontal flow suits inspection of larger items. Check the work-zone width, commonly 900–1800 mm, the filter grade, H14 HEPA or ULPA U15 for critical semiconductor work, and the air velocity control. Consider noise, which should remain under 65 dB(A), vibration, and ESD-safe surfaces for electronics. Stainless steel tops suit pharmaceutical use, while ESD-rated tops suit electronics. Decide whether a mobile stand, a wall-hung option or built-in lighting is required. Benches for chemicals or biologicals require fume or biosafety protection instead, not a clean bench.