Class II Type B2 Cytotoxic Safety Cabinet

What is the Class II Type B2 Cytotoxic Safety Cabinet?

A Class II Type B2 cytotoxic safety cabinet exhausts 100 % of its air to atmosphere, with no recirculation into the work zone. It is the preferred design for compounding hazardous and antineoplastic drugs.

Overview

The B2 cytotoxic cabinet draws all supply air from outside the building through HEPA filtration and exhausts 100 % through a second HEPA filter and a dedicated duct, so no drug vapour returns to the room. Inflow velocity at the front grille is 0.38–0.51 m/s and downflow over the work zone is 0.25–0.35 m/s, protecting both operator and product. Because supply air comes from outside, total exhaust is higher than an A2, typically 700–1600 m3/h depending on width. A dedicated exhaust fan with interlock and make-up air are required, and the cabinet is certified for HEPA integrity, airflow and containment. The stainless work surface resists frequent disinfection, and a sash with a working height marking keeps the operator within the safe zone. Widths of 1200–1800 mm suit typical pharmacy workflows.

How does it work?

Cytotoxic cabinets combine the airflow of a Class II biosafety cabinet with a design that keeps hazardous drug particles and vapours away from the operator and out of the room. Room air enters at the front grille, forming an air curtain across the opening, and HEPA-filtered air flows downward over the work zone to protect the preparation. Exhaust is HEPA filtered, and the cabinet is typically operated without recirculation into the work zone, with all exhaust sent to a dedicated duct. Many designs hold the work surface at negative pressure and use a split or closed front so drug aerosols cannot escape. Some pharmacy units use sealed glove ports, giving isolator-style containment with no direct operator contact. Surfaces are smooth stainless steel or plastic for frequent decontamination, and the cabinet is a classified environment for aseptic operations. Certification covers HEPA integrity, airflow and containment testing.

What are the key features?

• 100 % exhaust with no recirculation
• External HEPA-filtered supply air
• Inflow 0.38–0.51 m/s and downflow 0.25–0.35 m/s
• Dedicated exhaust duct with fan interlock
• Stainless work surface for disinfection
• Certified for HEPA leak and containment

What are the technical specifications?

A typical class ii type b2 cytotoxic safety cabinet configuration offers cabinet type of Class II Type B2, inflow velocity of 0.38–0.51 m/s, downflow velocity of 0.25–0.35 m/s, recirculation of 0 %, total exhaust, total exhaust of 700–1600 m3/h and HEPA grade of H14 supply and exhaust. 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 B2 Cytotoxic Safety Cabinet is used in antineoplastic compounding, hospital pharmacy sterile prep, hazardous drug dose preparation and clinical trial drug handling. Across the wider Cytotoxic Cabinets class, laboratories also deploy it for antineoplastic drug compounding, hospital pharmacy aseptic preparation and hazardous drug dose preparation.

Which standards and certifications apply?

Relevant standards and methods include EN 12469 (biosafety cabinets), NSF/ANSI 49 (biosafety cabinetry), USP <800> (hazardous drugs handling in healthcare settings), USP <797> (pharmaceutical compounding, sterile preparations), ISO 14644-1 (cleanroom classification) and EU GMP Annex 1 (sterile manufacturing). 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 cabinet in a controlled area with correct room pressure relationships, commonly a negative-pressure buffer room, and away from doors and air diffusers. Change gloves and sleeves on a defined schedule and inspect them for pinholes, since operator protection depends on intact barrier and airflow. Decontaminate the work surface and interior after every session and use a closed-system transfer device where required. Verify HEPA integrity, inflow and containment at installation and at least annually, and after relocation or filter change. Do not exceed the maximum drug volume or use unapproved agents that would overwhelm the exhaust. Manage waste, sharps and spill kits according to the hazardous drug procedure, and keep a log of certification and decontamination.

How do I select the right Class II Type B2 Cytotoxic Safety Cabinet?

Choose Type B2 for hazardous drug compounding, especially with volatile agents. Confirm a dedicated exhaust fan, hard duct, interlock and adequate make-up air. RFQ: drug list, total exhaust, duct route, room pressure plan and certification schedule.

How does it compare with other Cytotoxic Cabinets variants?

Select the cabinet from the hazardous drug list, the required dose accuracy and the pharmacy's aseptic requirements. Use a Class II Type B2 cytotoxic cabinet with 100 % dedicated exhaust when volatile hazardous drugs are prepared. Choose a Compounding Aseptic Containment Isolator where the highest operator protection is needed and full isolation is acceptable, since glove access reduces dexterity. A Type A2 cytotoxic cabinet with canopy exhaust suits lower-risk drugs when recirculation is limited and local rules allow it. Confirm compatibility with USP <800> and USP <797> requirements, the pharmacy's risk assessment and any local rules on where the cabinet is placed, including a negative-pressure buffer room. Verify certification, plan for HEPA leak and containment testing, and specify the transfer method for drugs and waste.