Walk-in coolers are defined as an engineered, refrigerated storage room.  They can be found in restaurants, food storage facilities, convenience stores, and research laboratories.  A walk-in cooler should be able to maintain a temperature as low as 35 degrees F.  They are pre-engineered or pre-fabricated units that come in both standard and custom sizes.  Custom walk-in coolers can be manufactured to meet specific size and shape requirements.