The DH AutoFlow NU-5500 CO2 incubator utilizes a digital, solid-state programmable microprocessor infrared [IR] CO2 sensor; dual temperature sensor probes; and various status alarms that make necessary corrections to the chamber environment supporting chamber uniformity and quicker recovery times. The interior chamber walls are lined with high tech R5 insulation for temperature stability and energy efficiency. Every AutoFlow incubator utilizes a 99.99% HEPA filtration system ensuring a Class 100 air quality inside the work chamber. The interior chamber is maintained at a positive pressure similar to an ISO Class 5 Cleanroom. AutoFlow offers a smaller footprint with largest amount of usable interior space (6.65 ft3).