Two standard models are available “SPR” and “APR”  both models have prime painted 12ga Steel body with Interlocking device allowing only one door at a time to be opened. “SPR” model has Interior door is prime painted and exterior door stainless steel with outside door release from interior. Locking paddle latch on interior door and pull handle on exterior door with automatic exterior door closer. Prime painted mounting flange on exterior is welded with the interior flange adjustable to accommodate various wall thickness. “APR” model Interior door is prime painted and exterior door stainless steel  with  paddle latch on both interior and exterior door and automatic exterior door closer. Prime painted mounting flange on exterior is welded with the interior flange adjustable to accommodate various wall thickness.