Pottorff's LIST Louver Information and Selection Tool is your online source for choosing the correct louver for any project based on parameters including construction and performance. This tool is meant as a helpful source when selecting Pottorff louvers and should not be used as the only basis for choosing your louver products. This information can change at any time so please double-check and review all selections with our customer service staff and website. Pottorff does not offer a warranty for this program.