Acudor LT-4000 Aluminum Access Door 18 x 18The Acudor LT-4000 is a lightweight aluminum access door for walls and ceilings. With a durable design and lightweight components, access to large openings in walls and ceilings is made easy. The mitered aluminum frame provides an architecturally pleasing appearance. The aluminum door panel is lined with 3/4″ polystyrene insulation. The all aluminum construction of the LT-4000 is ideal for exterior applications, and also those specific interior applications where corrosion or moisture is a concern. Optional gasketing between the door and frame can be provided to insure an airtight fit.Acudor LT-4000 Aluminum Access Door 18 x 18 Features: Light weight, insulated aluminum access door Ideal for exterior use or where corrosion and moisture is a concern Optional gasket between door and frameAcudor LT-4000 Aluminum Access Door 18 x 18 Specifications: Material: Aluminum: .045 door and frame. Door: Flush to edge of frame. Frame: 1-5/16″ mitered aluminum extrusion flange with 1-1/2″ deep mounting frame. Hinge: Concealed. Insulation: 3/4″ polystyrene insulation, with 3.8 r-value at 75 degrees F mean temperature. Gasketing: (if required) 1/8″ X 3/8″ closed cell neoprene gasketing. Latch: Screwdriver operated cam latch. Finish: Mill finish.* Dimensions are W x H