This forced air system ensures complete homogeneity of the atmosphere within the oven. Sample disturbance is minimized through the implementation of the patented vortex circulation system which circulates the air throughout the walls of the oven (see diagram). Can be operated as an open or sealed system. Temperature range up to 300 degrees and available in 2, 4, 8, 14 and 25 cu. ft. 'Comfort' option available along with HEPA filter for air inlet, seperate PT-100 sensor and two door version.