With dual refrigeration, fresh foods thrive in a humid yet chilly climate, while frozen and convenience foods get the dry, frigid air they need. An air purification system inspired by NASA technology scrubs the air of ethylene gas, bacteria, mold and viruses. A magnetic door seal system locks in cold, while a state-of-the-art microprocessor monitors each section of your Sub-Zero for pinpoint climate control. Storage capacity for the BI-30U is a generous 13.2 cu. ft. refrigerator, 4.2 cu. ft. freezer. Bottom line? More flavorful, delicious food for you, your family, your guests.