The units supply 10 percent outside air and 90 percent inside air. Both of the units are eligible for high tier rebates from Wisconsin Gas. Although there was no regulatory requirement mandating the changes, in 1999, the Gehl Company eliminated the use of Methylene Chloride degreaser from their process. The company worked with vendors to reduce the amount of oils used on steel parts to reduce inventory of raw materials at the plants. As a result, the company has reduced Methylene Chloride usage from 2,696 gallons in 1996 to 0 gallons in 1999.
All air compressors discharge some amount of oil in the air as it is compressed.
As water and oil condense, they are eventually discharged into the sanitary sewer district. To eliminate any possible discharge to the Sanitary Sewer System, Gehl Company installed charcoal filter systems on two of the air compressors.