30" x 54" Steel Cover and Frame - Roof Hatch - Ship Stair Access - Miami Dade Approved

• Miami-Dade County and Florida Building Commission approval for use in high velocity hurricane zones with large and small missile impac
• Engineered with compression spring operators to provide smooth, easy, one-hand operation, regardless of size
• Automatic hold-open arm locks the cover in the open
  position to ensure safe egress
• Overlapping cover design, full welded corners on cover and curb, EPDM rubber gasket, and fully insulated cover and curb ensure weathertightness and energy efficiency
• Constructed with corrosion resistant materials to provide many years of trouble free, dependable service
• Heavy gauge construction and positive latching mechanism
  maintain building security
• Curb features the Bil-Clip^® flashing system, an innovative
  method to quickly and easily secure single-ply roofing material
  to Bilco roof products
• Available in many sizes and curb configurations to satisfy any requirement or installation

*Specify model NB-20HZ or NB-50HZ with two-point latch 

• Material (select one): 
  Steel: Cover and frame are 14 gauge (2 mm) G-90 paint bond galvanized steel. 
  Aluminum: Cover and frame are 11 gauge (2.3 mm) aluminum. 
  Stainless Steel: Cover and frame are 14 gauge (2 mm) type 304 stainless steel
• Cover: Brakeformed, hollow-metal design with 1" (25 mm) concealed fiberglass insulation, 3" (76 mm) beaded, overlapping flange, fully welded at corners, and internally reinforced for 40 psf (195 kg/m²) live load.
• Curb: 12" (305 mm) in height with integral capflashing, 1" (25 mm) fiberboard insulation, fully welded at corners, and 3-1/2" (89 mm) mounting flange with 7/16" holes (11 mm) provided for securing frame to the roof deck.
• Gasket: Extruded EPDM rubber gasket permanently adhered to cover.
• Hinges: Heavy-duty pintle hinges with 3/8" (9 mm) Type 316 stainless steel hinge pins.
• Latch: Slam latch with interior and exterior turn handles and padlock hasps. (For Type NB-20HZ and NB-50HZ Miami-Dade County approved models: Specify enclosed two-point spring latch with interior and exterior turn handles and padlock hasps)
• Lift Assistance: Compression spring operators enclosed in telescopic tubes. Automatic hold-open arm with grip handle release.
• Finish: 
  Steel: Alkyd base red oxide primer. 
  Aluminum: Mill Finish. 
  Stainless Steel: Type 304 stainless steel with bead blast finish
• Hardware:
  Steel: Engineered composite compression spring tubes and steel compression springs packed in grease. All other hardware is zinc plated/chromate sealed. 
  Aluminum: Engineered composite compression spring tubes and steel compression springs packed in grease.Type 316 Stainless steel hinges. All other hardware is zinc plated/chromate sealed. 
  Stainless Steel: Type 316 stainless steel.