Benchtop Class I Biosafety Cabinet

What is the Benchtop Class I Biosafety Cabinet?

A benchtop Class I biosafety cabinet sits on a laboratory bench and provides single-pass HEPA exhaust for low-risk work. It protects the operator and environment from aerosols where sample protection is not required.

Overview

The unit is typically 900–1500 mm wide, 600–800 mm deep and 700–900 mm high, built in epoxy-coated or stainless steel with a stainless work surface. Room air enters at 0.7–1.0 m/s across the front grille, sweeps the work zone and leaves through a HEPA filter rated at least 99.97 % at 0.3 µm. It may recirculate filtered air to the room or connect to a duct by a thimble or direct collar. A sliding glass sash, interior lighting and a UV lamp are standard, with an airflow alarm and a pressure gauge to show filter loading. Internal height is limited, so tall equipment may not fit. The compact footprint suits teaching, veterinary and general microbiology benches where product protection is not needed.

How does it work?

A Class I cabinet works like a ventilated enclosure with a single HEPA-filtered exhaust path. Room air is pulled through the front opening at an inflow velocity of about 0.7–1.0 m/s, sweeps across the work surface, and carries aerosols and particles away from the operator. The air then passes a HEPA filter rated at least 99.97 % efficient at 0.3 µm before being discharged, either back into the room through a recirculating arrangement or, more commonly, to the atmosphere through a duct. Because there is no filtered supply air over the work zone, the cabinet does not protect the sample from contamination. Cabinets have a stainless steel work surface, a glass or polycarbonate sash, interior lighting and usually a UV lamp for surface decontamination between uses. Airflow alarms and a front grille complete the design; performance is confirmed by filter leak and airflow testing.

What are the key features?

• Single-pass HEPA exhaust at 99.97 % or better
• Inflow velocity 0.7–1.0 m/s at the front grille
• Width 900–1500 mm for benchtop mounting
• Sliding glass sash and interior lighting
• UV lamp for surface decontamination
• Airflow alarm and filter pressure gauge

What are the technical specifications?

A typical benchtop class i biosafety cabinet configuration offers cabinet class of Class I, inflow velocity of 0.7–1.0 m/s, HEPA grade of H14, ≥ 99.97 % at 0.3 µm, width of 900–1500 mm, internal height of 600–750 mm and work surface of Stainless steel 304. 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 Benchtop Class I Biosafety Cabinet is used in low-risk microbiology, teaching laboratories, veterinary sample handling and powder weighing. Across the wider Class I Cabinets class, laboratories also deploy it for low-risk microbiology, centrifuge and equipment enclosures and veterinary and agricultural work.

Which standards and certifications apply?

Relevant standards and methods include EN 12469 (biosafety cabinets), NSF/ANSI 49 (biosafety cabinetry), ISO 14644-1 (cleanroom classification), GB 19489 (biosafety laboratory requirements) and IEC 61010-1 (safety requirements for electrical equipment). 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.

Install the cabinet away from doors, vents and high-traffic areas, with clearance for service and filter replacement. If ducted, verify the exhaust fan and duct are dedicated and that airflow cannot fall below the alarm threshold; an undersized or blocked duct can reverse the internal flow. Confirm filter integrity and inflow velocity at installation and at least annually, and record results. Reduce clutter inside the cabinet, since bulky items disturb airflow and reduce protection. Clean the work surface before and after use, use UV lamps only as a supplement to chemical disinfection, and never rely on UV for penetrating surfaces. Confirm that the exhaust discharge point meets local requirements.

How do I select the right Benchtop Class I Biosafety Cabinet?

Choose the benchtop Class I when sample protection is not required and bench space is limited. Confirm inflow velocity and whether exhaust is recirculated or ducted. RFQ: width, internal height, exhaust route, electrical supply and UV requirement.

How does it compare with other Class I Cabinets variants?

Choose a Class I cabinet when operator and environmental protection are needed but the sample does not require protection, for example for low-risk microbiology, homogenising, or housing a centrifuge or shaking device. Confirm the inflow velocity and HEPA exhaust arrangement, and decide whether exhaust goes to the atmosphere by duct or is filtered and recirculated, since recirculation is not acceptable for many agents. Match the internal height to the equipment housed and the external footprint to the bench or floor space. Check whether the cabinet must be connected to an exhaust system and whether a thimble or direct connection is used. Confirm certification to EN 12469 or NSF/ANSI 49 where applicable, and plan annual recertification. Class I cabinets are not suitable when sterile product protection is required.