Agricultural and Biosystems Engineering
Barn ventilation systems using gravity (natural) airflow that enters through wall openings and goes out top ridge vents have been used a long time in swine, dairy, beef, and poultry barns (Figure 1). A comparatively new development is to use a plastic curtain, adjustable up and down, for the full height and length of each wall, particularly in dairy barns. This ventilation system is being adapted in northern states after many years use in poultry barns in the southeastern United States.
Johnson, Dexter; Durland, G.R.; and Anderson, Gary, "Plastic Curtain Wall Use for Barn Venting" (2002). SDSU Extension Extra Archives. 11.