Horizontal Laminar Flow Clean Bench

What is the Horizontal Laminar Flow Clean Bench?

A horizontal laminar flow clean bench pushes HEPA-filtered air from the back of the work surface toward the operator, bathing cultures in sterile air. It is chosen where only sample protection is needed and no hazardous material is handled.

Overview

Air is drawn from the room or a plenum, filtered through a HEPA panel at the rear of the work zone and delivered as a horizontal laminar stream at 0.3–0.5 m/s toward the operator. Because the airflow continuously sweeps particles away from the work area and never passes over the operator's arms before reaching the samples, particle counts in the work zone stay low and cultures are well protected. The same airflow direction means aerosols generated by the sample travel toward the operator, so the bench must not be used with infectious, toxic or allergenic material. Benches are quieter and less expensive than class II cabinets, have no front sash to restrict movement, and are widely used for media preparation, plate pouring and non-hazardous cell culture.

How does it work?

Sterile work depends on supplying particle-free air and preventing entry of contaminants from the room. Room air is drawn through a HEPA filter that removes 99.99% of particles at 0.3 µm, and the filtered air flows in a laminar stream over the work surface. In a clean bench, air moves horizontally or vertically across the surface and out toward the operator, protecting the sample only. In a class II biological safety cabinet, air enters a front grille, passes through the supply filter to create a sterile downflow curtain, and is then split so that part recirculates and part is exhausted through a second HEPA filter, protecting both product and operator. A front air barrier prevents room air from entering the work zone when arms reach in, and airflow velocities are designed to balance containment against the risk of disturbing cultures.

What are the key features?

• Horizontal HEPA-filtered airflow at 0.3–0.5 m/s
• Open work area without a front sash
• Stainless steel work surface with removable tray
• Low noise and low power consumption
• UV lamp and fluorescent illumination options
• Simple filter replacement with front access

What are the technical specifications?

A typical horizontal laminar flow clean bench configuration offers working width of 0.9–1.8 m, airflow velocity of approx. 0.3–0.5 m/s, filtration of HEPA, 99.99% at 0.3 µm, cleanliness of ISO Class 5 (Class 100) in the work zone, noise level of below 62 dB(A) and operator protection of None; not for hazardous material. 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 is used in media preparation and plate pouring, non-hazardous cell line culture, plant tissue culture and electronics and optics assembly requiring clean air. Across the wider Cell Culture Hoods class, laboratories also deploy it for aseptic cell culture and subculture, primary cell and stem cell handling and media preparation and bottle filling.

Which standards and certifications apply?

Relevant standards and methods include EN 12469, NSF/ANSI 49, ISO 14644-1, IEC 61010-1, IEC 61326-1 and USP <1046>. Certification candidates for this model are CE, ISO 14644-1 cleanliness verification 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.

A new or relocated cabinet must be certified after installation and yearly thereafter, with filter integrity, downflow velocity, inflow velocity and airflow visualisation recorded against EN 12469 or NSF/ANSI 49. Avoid placing the cabinet near doors, windows, air supply diffusers or high-traffic routes, because draughts disturb the air barrier. Clean the work surface before and after use with 70% ethanol or a compatible disinfectant, and run the blower for several minutes before starting work. Do not block the front or rear grilles with equipment, since that alters airflow and can break containment. UV lamps are a supplement, not a substitute, for cleaning, and should be replaced when intensity falls below specification. Record certification, cleaning and maintenance in a log for audit purposes.

How do I select the right Horizontal Laminar Flow Clean Bench?

Select a horizontal clean bench only for non-hazardous work where sample protection alone is needed, such as media preparation or clean assembly. Specify working width, airflow velocity, filter size and access, UV and lighting options, and confirm that no infectious or toxic aerosols are produced.

How does it compare with other Cell Culture Hoods variants?

Decide first whether the operator needs protection. Any work with human or animal cells, infectious material or genetically modified organisms requires a class II cabinet, and a type A2 model covers most cell culture needs when recirculating exhaust is acceptable. Type B2 cabinets exhaust all air to the outside and are used with volatile chemicals or radionuclides that must not recirculate. Clean benches are appropriate only for non-hazardous cultures where sample protection alone is sufficient. Then check working dimensions, airflow velocities and alarms, filter integrity test points, interior material, UV lamp, and whether an electrical outlet panel and gas or vacuum service are needed inside the work zone. Confirm that the cabinet will be certified after installation in your laboratory and that the annual certification service is available locally.