Designed for all types of chilled and frozen products, Ross Industries Boundary Layer Control impingement tunnel has NSF-approved cam-lock panels constructed of urethane foam wrapped in stainless steel. Mating panel edges are closed with hygienic, compressed gaskets and cam-lock latches. The modular design of the cam-lock panels allows expandability of the tunnel for future capacity rate increases. The coil evaporators feature small-diameter aluminum tubes with a fin spacing. Thousands of controlled jets of refrigerated air blast away the insulating boundary layer of heat surrounding the product to freeze it quickly. The unit produces cold air using a conventional ammonia or Freon refrigerant system.