Inquiry (采购产品): louver need a 18x18 alum louver with a flange. with a open and close damper. installing louver through a cinder block wall, and want to be able to close a damper **** Hidden Message ***** scot friedman 11706 Company: amsco a/c E-mail: amscoac@aol.com **** Hidden Message ***** amscoac@aol.com
