Doors are Fire Rated by Underwriters Laboratories Inc., for 1-1/2 hours, "B" Label, and meet ANSI-UL 10B standard. Door has a heavy duty spring closer to assure positive latching when panel closes. This door is for wall installation only. Door and Frame are fabricated from 16 gauge, galvannealed steel with a prime coat finish. Door has a heavy duty spring to assure positive latching. Frame is equipped with both masonry anchors and bolt holes to facilitate installation in all types of wall construction. Concealed Hinge operates completely out of sight so that only the door and frame is visible. Exterior Latch is recessed and is operated using a ring attached to the sliding bolt. Interior Latch Release Slide is included enabling door to be opened from the inside. Finish is a prime coat suitable for painting.