A counter display unit (CDU) is a retail display unit normally placed on a shop counter to encourage consumer impulse purchases.Before we start, here is a small introduction about display counters- These are the commercial kitchen equipment usually placed at the entrance of restaurants where you can display your best dishes that are visually appealing food items.The display counters with forced air refrigeration system only relies on the fans. The fans circulate the cold air throughout the cabinet so that the food products can be kept chilled. The display cabinets are used mostly for displaying the bakery products or the prepackaged products.