Rainier Precision, Inc. was founded in Seattle, Washington by J.W. Trosper over 50 years ago. The company has evolved and now operates under the Rainier Precision name which has been family owned and operated for over 50 years. The company manufactures all the Dri-Z-Air products at their Redmond, Oregon facility. Dri-Z-Air is a highly effective, salt based dehumidifier which has been trusted since 1948 and made with pride in the U.S.A.