This optional wall sleeve for the large wall mounted fire-rated pet door will be necessary if your stud walls are deeper than 2 x 4 walls (4 5/8″ thick).
We are a small family owned company. We used American ingenuity to design this door and worked with American manufacturers to get it put together.
FireSafe Pet Doors LLC
89 Center Rd, Petaluma CA 94952-1028 USA