Fairfield Industries P.O. Box 19302105 West Jackson AvenueFairfield, IA 52556 US Phone: 641.472.2153 Fax: 641.472.7467 E-Mail: FFProducts@Lisco.com Web site: www.fairfieldproducts.com All Categories>Automatic Ventilation Control>Item # Model 18231 larger imageItem # Model 18231, Automatic Ventilatio...