Mechanical refers to ventilation by fans. It should be noted that the hybrid system is by far the most popular and a relatively new development in the industry. Tunnel ventilation has limited usage in finishing facilities. Figure 1 Ventilation systems for finishing. Figure 2 shows cooling methods.
Drip refers to drippers, spray to cyclic spraying and tunnel to tunnel ventilation.
Sprayer systems appear to be the most popular put nearly as many use no cooling system at all. Figure 3 shows the manure systems that were chosen by survey respondents. Deep pits appear to be the most popular. This trend, while not the best from an air quality standpoint, has been the best mode of avoiding state permit requirements and has therefore made a resurgence. In addition to compiling the average costs across the entire survey, averages were done by type of manure handling method and by the year of construction.