Air-flow and power measurements of two cottonseed storage aeration systems were made during the summer of 2000. These measurements provide insight into the energy cost and static losses of concrete aeration ducts. Power consumption was measured for different flow rates in a rough concrete duct and energy costs computed for the different flow rates. An energy price of $0.06/KWH, 800 feet of the rough concrete duct needed to aerate 6400 tons of seed at 5 CFM/ton resulted in approximately $425 per year greater energy cost than conveying the same amount of air through smooth round metal pipe at the same velocity. Doubling or tripling the energy rates will double or triple the cost differential. Slower velocities within the ducts reduce static pressure losses and thus energy costs. Persons considering construction of cottonseed storage facilities should consider the lifetime energy cost of different duct designs before selecting a final design. Several alternative designs are discussed.