NEW AIR NBD-23-SB Solid Single Door Beer Dispenser – 184 L / 6.5 Cu. Ft. – Ideal for Bars, Restaurants, Hotels & Cafés. The NEW AIR REFRIGERATION NBD-23-SB Solid Single Door Beer Dispenser is a premium draft beer cooler designed for bars, restaurants, hotels, cafés, and even home enthusiasts. With a generous 6.5 cu. ft.