Manufacturers can access all the necessary documents to enroll in the program below. Enrollment is a required first step in certifying products to AERC standards. Generally, AERC distinguishes between two manufacturer types: window attachment manufacturers and material manufacturers. Window attachments manufacturers make complete products such as blinds, shades, shutters and storm windows. Material manufacturers make the components of those attachment products, such as fabric. A single company may be both a window attachment manufacturer and a material manufacturer.