To size the AD-500 unit for double doors with mullion, we need the following: · Mullion Depth is the distance from the face of the door to the face of the mullion. Our products work within a range based on mullion depth. · Mullion Width is the distance across the face of the mullion. This dimension becomes important when sizing a glass door with narrow metal frames. · Free Space is the distance between the mullion and the edge of the stile (frame) that supports the glass. This dimension also becomes important when sizing glass doors with narrow metal stiles (frames). AD-500's have either five-inch (5") or seven-inch (7") hook centers. This defines the attachment block position on the door. When sizing for glass doors, pay attention to mullion width and free space based on the centers above. Each unit comes with •Installation Instructions •Door Attachment Kit including attachment blocks and hardware •Storage Hanger Kit •Protected by Ultra-Dog Door Label Standard Features •High-Strength Materials: each component has undergone rigorous testing. •Lightweight. •Patented Cam Action: pulls door tighter against the frame. •Patented Range Adjustment adjusts to door jamb size. •Heat-Treated Hooks and Pins for superior strength. •Serrated Surfaces of Hooks extrudes through the plastic caps and bites into the attachment block pins as the real force on the hooks increases. •Reflective Push to Unlock label. •Remove During Business Hours label on commercial models, Warning: Hold Product When Releasing label on residential models. •Fits flush to inside of door jamb or frame opening width. •Five-Year Limited Warranty.
