Cold air loops on both bottom and top surface of the pans, Top holds up to (12) 1/6 size, 6" deep food pans (with pans) -R290 refrigerant benefits the environment with more energy-efficient. -Electonic carel control system makes it easy to adjust temperature set point and defrost frequency. -Self-closing doors with 90 degree stay-open feature; Standard door handle ,lock and key included. -The epoxy-coated steel shelf could hold heavy bulk ingredients -Pre-installed heavy duty Embraco compressor and casters with brakes. -Stainless steel 304 exterior and 430 interior, ensure longer life.