A stackable water-jacketed CO2 incubator, used for environmental control of culture conditions. Reliable temperature retention with triple-walled water jacket. Class 100 air with validatable in-chamber HEPA filtration system. Thermo Enviro-Scan microprocessor message center and digital controller. Temperature Range: Ambient +5°C to 55°C; Temperature Uniformity: ±0.2°C; CO2 Range: 0% to 20%; Gas Control Resolution: ±0.1%; Chamber: 6.5 cubic ft, 21.3” x 39.5” x 25” (WxHxD), 17 shelf slots.