Type NB roof hatches, 30" x 54" (762mm x 1372mm), are ideal for installations where frequent use may be expected. Permits easier movement of maintenance personnel, tools and equipment. Available in galvanized steel, aluminum, or stainless steel construction.
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
Ship stair sold by others
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
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.
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.
Heavy-duty pintle hinges with 3/8" (9 mm) Type 316 stainless steel hinge pins.
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)
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.