The insulated Fire-Rated Security Access Door is constructed of heavy-duty materials to prevent unwanted access through openings in fire-rated vertical surfaces. Features Fire-Rated Self-Closing Door Wall Installation Only Custom Sizing Specifications Model BST/BSW/BSP Door 14-gauge Steel Outer Door20-gauge Steel Inner Door Frame 16-gauge Steel Size Min: 6 inches by 6 inchesMax: BST: 24 inches by 72 inches or 48 inches by 48 inches BSW/BSP: 36 inches by 48 inches Installation Wall Flange 1 inch Exposed, Drywall Bead or Plaster Bead Hinge BST: Flush Continuous PianoBSW/BSP: Concealed Pin Insulation 2-inch Fire-Rated Mineral Fiber Certification UL listed "B" label for 1-1/2 hours Finish White Powder Coat Warranty 1 year Options Flanges, Latches, Materials, Gaskets, Anchors Order Guide BASE FLANGE LATCH WIDTH X LENGTH OPTIONS BS X T - 1 inch FlangeW - Drywall BeadP - Plaster Bead K - Knurled Knob / Key Operated Latch BoltM - Mortise Lock Prep (1-1/8") Standard Sizes (in.)12 x 12 24 x 2416 x 16 24 x 3618 x 18 24 x 4022 x 30 24 x 48 B - GalvannealedG - GasketingM - Masonry AnchorsS - Stainless Steel, Type 304 Rough opening is door size + 1/4 inch minimum.Additional sizes available, call for more information. What Size Door Do I Need? Rough Opening Chart DOOR SIZE(Width x Height) ROUGH OPENING (RO)(Width x Height) 6 x 6 6-1/4 x 6-1/4 8 x 8 8-1/4 x 8-1/4 10 x 10 10-1/4 x 10-1/4 12 x 12 12-1/4 x 12-1/4 12 x 18 12-1/4 x 18-1/4 12 x 24 12-1/4 x 24-1/4 14 x 14 14-1/4 x 14-1/4 16 x 16 16-1/4 x 16-1/4 16 x 20 16-1/4 x 20-1/4 18 x 18 18-1/4 x 18-1/4 18 x 24 18-1/4 x 24-1/4 20 x 30 20-1/4 x 30-1/4 22 x 22 22-1/4 x 22-1/4 22 x 30 22-1/4 x 30-1/4 24 x 24 24-1/4 x 24-1/4 24 x 30 24-1/4 x 30-1/4 24 x 36 24-1/4 x 36-1/4 24 x 48 24-1/4 x 48-1/4 30 x 30 30-1/4 x 30-1/4 30 x 36 30-1/4 x 36-1/4 32 x 32 32-1/4 x 32-1/4 36 x 36 36-1/4 x 36-1/4 All dimensions are in inchesRough opening is door size + 1/4" min to 1/2" maxAdditional sizes available, call for more information