NCB-D® Exceeds Class II, Type B1 Criteria   NCB-D® includes additional, unique design features proven to enhance containment while inhibiting cross contamination and exposure to chemicals, vapors and gases.  

• All exhaust air is removed directly from the work area (direct exhaust) into the facility’s separate exhaust system.   
• Vapors and gases emitted from vessels or work behind the air split (approximately half way back from the cabinet front) are removed and not recirculated.   
• HEPA filters located below the work surface assure that all positive pressure areas are free of particulate contamination. Additionally, all positive pressure plenums are completely surrounded by negative pressure. Recirculated air is HEPA-filtered immediately below the work surface before it is passed through a supply downflow filter above the work area.   
• All unfiltered air in the cabinet flows under negative pressure in dedicated ducts.   

Features  

• A high velocity suction channel prevents gases or particles from migrating behind the viewscreen and entering the work area.   
• Sliding 10,º ergonomically sloped viewscreen provides easy access to the work area.   
• Mass Airflow Monitor automatically activates an audio/visual alarm if exhaust airflow in the duct decreases below the calibrated set point.   
• A non-glare satin finish work surface with wide radius corners improves user comfort and simplifies cleaning.   
• The HEPA filters located below the work surface provide an added measure of protection by eliminating contamination in the blower/motor area and positive pressure areas of the cabinet.   
• HEPA filters accessible through the work chamber - patent pending    Positive pressure plenums are downstream of HEPA filters and are completely surrounded by negative pressure.   
• Padded ergonomic arm rest.