Hummerts International located in St. Louis, MO also has a nice online catalog with a number of greenhouse/coldframe components for sale. http://www.hummert.com/aboutus.asp Boyce Tankersley Director of Living Plant Documentation Chicago Botanic Garden 1000 Lake Cook Road Glencoe, IL 60022 tel: 847-835-6841 fax: 847-835-1635 email: btankers@chicagobotanic.org -----Original Message----- Different kinds of automatic vent controls can be obtained from Charley's Greenhouses in Washington; they have a website and print catalog. Jane McGary Northwestern Oregon, USA _______________________________________________ pbs mailing list pbs@lists.ibiblio.org http://www.pacificbulbsociety.org/list.php http://pacificbulbsociety.org/pbswiki/