Regarding ventilation systems, the DLS Structure can be designed to be built to the producers preference. Whether it be natural, tunnel or cross ventilated barns, DLS has detailed and researched plans for each ventilation style. DLS has found the ACME fans to be one of the most efficient and durable fans on the market. All the components for the fans are made in the U.S.A., and in 2015, ACME had the only fan that qualified for the Wisconsin Save on Energy grant. The fans are also one of the quietest on the market. DLS uses the High Plains Norbco curtains which are the strongest and toughest material used in the market. The material of the curtains is a heavy duty 16 oz. fabric.