Horizontal Laminar Flow Clean Bench for Cleanroom Inspection

What is the Horizontal Laminar Flow Clean Bench for Cleanroom Inspection?

A horizontal laminar flow clean bench delivers HEPA-filtered air from the rear wall toward the operator across the work surface. It suits inspection, assembly and handling of larger items in cleanrooms. It is typically chosen for open-front handling.

Overview

The HEPA filter forms the full rear wall, typically 900 × 600 mm or 1200 × 600 mm, and air exits the open front at 0.3–0.5 m/s. Work surfaces are solid stainless steel, with standard widths of 900, 1200 and 1500 mm and depths of 600–800 mm. Because the flow is horizontal, objects placed in the stream can cast turbulence downstream, so placing items at least 150 mm from the filter and avoiding stacking is advised. The design allows large objects and wide openings, making it practical for optical components and boards. A digital velocity display and filter-life monitor are included. The body is powder-coated steel with a stainless steel work surface, and LED lights are mounted above the work zone.

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?

• Full rear-wall HEPA filter with horizontal airflow
• Solid stainless steel work surface
• Wide open front for large items
• Digital velocity display and filter-life monitor
• LED lighting above work zone
• Powder-coated steel body

What are the technical specifications?

A typical horizontal laminar flow clean bench for cleanroom inspection configuration offers airflow direction of Horizontal (rear to front), air velocity of 0.3–0.5 m/s, cleanliness class of ISO 5 (Class 100), filter grade of H14 HEPA, work-zone width of 900 / 1200 / 1500 mm and work-zone depth of 600–800 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 Horizontal Laminar Flow Clean Bench for Cleanroom Inspection is used in optical inspection, PCB assembly, sensor assembly and sterile tool preparation. 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 Horizontal Laminar Flow Clean Bench for Cleanroom Inspection?

Select horizontal flow for inspection of larger or flat items and open-front handling. It is less suitable for working directly over open product. RFQ: width, depth, filter, surface material and ESD needs. Also state the required ISO class.

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.