Class II Type A2 PCR Safety Cabinet

What is the Class II Type A2 PCR Safety Cabinet?

A Class II Type A2 PCR safety cabinet provides HEPA-filtered downflow for the sample and inward airflow for the operator, with a UV lamp, so infectious material can be prepared for PCR. It is the right choice for clinical and public-health laboratories handling specimens that must be contained.

Overview

A Class II Type A2 cabinet draws room air inward through the front grille at a minimum velocity of 0.5 m/s, passes it through a HEPA filter, and directs about 70% of the filtered air downward over the work surface while 30% exhausts through a second HEPA filter to the room or ducted outside. This gives three protections: the operator, the sample and the environment. The cabinet complies with EN 12469 or NSF/ANSI 49 when tested and certified. A UV lamp, sash alarm and airflow monitor are usual. Work widths are 900–1800 mm. Pre-PCR use requires careful cleaning between sessions because recirculated air can carry particles. Annual certification is required.

How does it work?

PCR contamination arises mainly from amplicons carried over from previous reactions and from ambient DNA. A PCR workstation reduces this risk with three mechanisms. First, an enclosed or laminar-flow workspace limits airborne particles: HEPA filters remove at least 99.99% of particles at 0.3 µm, and airflow passes in a controlled direction over the work surface. Second, ultraviolet light at 254 nm crosslinks DNA on surfaces and in air inside the cabinet, destroying residual template. Third, smooth stainless steel or epoxy surfaces allow chemical cleaning with bleach or DNA-decontaminating reagents. Some systems add a door interlock so UV cannot run when the sash is open, and timers for automatic UV cycles.

What are the key features?

• Operator, sample and environment protection in one cabinet
• Inflow velocity of at least 0.5 m/s at the front aperture
• Dual HEPA filtration of supply and exhaust air
• Sash alarm and airflow monitor with filter-life indicator
• UV lamp with timer and interlock
• Stainless steel work tray for chemical decontamination

What are the technical specifications?

A typical class ii type a2 pcr safety cabinet configuration offers cabinet class of Class II Type A2, inflow velocity of ≥ 0.5 m/s, downflow velocity of 0.25–0.50 m/s, HEPA filters of H14 supply and exhaust (EN 1822), work width of 900–1800 mm and sash opening height of 200–250 mm working. 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 Class II Type A2 PCR Safety Cabinet is used in clinical specimen pre-PCR preparation, infectious disease diagnostics, public health surveillance laboratories and biosafety level 2 molecular work. Across the wider PCR Workstations class, laboratories also deploy it for pre-PCR reagent and sample set-up, forensic DNA analysis and molecular diagnostics.

Which standards and certifications apply?

Relevant standards and methods include EN 12469, NSF/ANSI 49, ISO 14644-1, EN 1822 (HEPA filters), IEC 61010-1, IEC 61010-2-101 and CLSI MM19. 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 workstation in a low-traffic area of the pre-amplification room, away from doors and air vents. Clean surfaces before and after use with 10% bleach followed by water or 70% ethanol, and run the UV cycle, typically 15–30 minutes, before work. UV lamps lose output with age, so record hours and replace them at the manufacturer's interval, usually 6,000–9,000 hours. Test HEPA filter integrity and airflow velocity at installation and annually, or as required by the standard applied. Keep pipettes, tips and racks dedicated to the workstation, and never bring amplified product or post-PCR equipment into the pre-PCR area.

How do I select the right Class II Type A2 PCR Safety Cabinet?

Select a Class II A2 cabinet when infectious specimens are prepared for PCR and operator protection is required. It costs more than hoods and needs annual certification, plus an exhaust plan. In an RFQ, specify width, standard of certification (EN 12469 or NSF/ANSI 49), UV, alarms, exhaust connection, installation and certification services.

How does it compare with other PCR Workstations variants?

Select by the level of protection needed. A UV dead-air cabinet protects reagents at low cost, a laminar-flow hood adds HEPA airflow for cleaner preparation, and a Class II cabinet also protects the operator when handling infectious samples. Check interior size against the racks, pipettes and centrifuge you need inside, and confirm UV lamp wavelength, timer and door interlock. Ductless carbon-filter units suit post-PCR work with volatile reagents. Automated set-up stations reduce manual variability and suit high volumes. Consider noise, vibration and lighting, and whether the workstation must be certified to a biosafety standard such as EN 12469 or NSF/ANSI 49.