Pottorffs 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.