Insulsure AT-2 Attic Tent - 25 x 54 x 7 in. PURPOSE: Specially engineered, patented insulator designed to create an air transfer barrier between your attic and living areas. MOST COMMON SIZE: AT-2 is the most commonly used size for fold down attic stairs | 25 inches wide - 54 inches long- 7 inches high clearance with a 2 inch mounting flange USES: Used for fold down attic stairs, scuttle Holes and Knee wall doors. CONSTRUCTION: Nylon Fabric and Polyurethane Form + Flame Retardant