Aluminium frame with panels made of acrylic glass, six compartments and six doors with cylinder lock, including six hygrometers, six trays and six shelves made of stainless steel, usable with up to 8 shelves per compartment, with four casters (two of them with brakes) and central connection for exhaust air and gas filling including pressure regulator at rear side. A pipe system leads the gas into the individual compartments each compartment is equipped with a flow meter to control the gas supply, a non-return valve at the exhaust air connection of each compartment prevents gas from flowing back into the compartment. Tubes for gas filling are not included.