Abstract: An indirectly cooled type cold storage unit adapted to effectively remove ethylene gas generated from storage products, and which can be easily handled during assembly, comprises a heat-insulating outer housing, an inner housing of high heat-conductive material located in the outer housing with a space therebetween and defining therein a storage chamber, and a cooling device for circulating cold air in the space between the outer and inner housings whereby the inner housing is cooled so as to indirectly cool the storage chamber and its contents. An adsorbing and decomposing sheet-like agent composed of ethylene decomposing catalyst and active carbon is provided in communication with the inside of the storage chamber in a manner such that the ethylene gas passes only through the box and not through the space between the two housings.

Abstract: A low-temperature storage case having; a food storage room inside a thermally good conductive inner box which is surrounded by a thermally insulating outer box, and a cold-air circulation space between the two boxes; and a refrigeration unit disposed in the cold-air circulation space. Ethylene adsorbing members are provided on at least a portion of the inner box with one surface of each ethylene adsorbing member is exposed to the storage room and other surfaces exposed to the cold-air circulation space so as to adsorb ethylene gas in the storage room. In order to re-activate the ethylene adsorptibity of the adsorbing members, ther are provided; ventilation holes in the outer box; a heater disposed in the cold-air circulation space; and a ventilation unit mounted on the outer box for ventilating the cold-air circulation space as required.