Features Galvanized Steel Construction. Designed only for use with Plenums designed Curbs and Adapters. Not designed for use with OEM curbs. Available for most Plenums designed Knock Down Curbs, Platform Curbs and Vibration Isolation Curbs. Wind Load Certification required (purchased separately) to determine proper quantity and spacing. Documents & MediaRoof Curb Adapter Attachment DetailsList of Unitary Packaged Units with Accessories Available Product Search New Unit Search Submittals