Three doors across 2100 mm give the KBS21 a single compartment of 564 litres gross and 360 litres net for EN 60 × 40 cm trays. It is supplied without a worktop, 725 mm deep and 830 mm high, and holds −2…+8 °C in ambient temperatures up to 40 °C. Relative humidity is chosen on the thermometer-thermostat, 75% or 90%, and read on its digital display; a communication port is included.
Behind each door an AISI 304 rack offers seven positions at 75 mm. The fan-assisted system has an anti-corrosion evaporator and automatic electric defrost, and the cooling unit slides out for condenser cleaning. Energy class D: 3.749 kWh per 24 h, EEI 50.5, 1368 kWh a year, 50 dBA.
R290 (0.08 kg), 560 W at −10 °C, 360 W on 230 V. 123 kg net on adjustable feet of 140–200 mm.