National Guard Products 137NA Neoprene Bulb Perimeter Weatherstrip Set – Anodized Aluminum

National Guard Products (NGP) model 137NA is a neoprene bulb perimeter weatherstrip head-and-jamb set finished in anodized aluminum with a black neoprene bulb insert. Each set includes one head piece and two jamb pieces, sized to fit the complete door frame perimeter and screw-applied directly to the frame stop. Designed for commercial hollow metal and wood door openings, the 137NA delivers a tight, compression seal around the full perimeter — reducing air infiltration, blocking smoke and draft, and meeting rigorous UL fire-door certification requirements. The set is available in five standard opening sizes and is made to order with a lead time of 10–15 business days.

High-Performance Weatherstrip Features

• Aluminum Alloy Frame Body: Extruded from Alloy 6063, T5 temper for a rigid, dimensionally stable retainer that holds its profile over the life of the door.
• Neoprene Bulb Seal: The bulb insert is manufactured from synthetic EPDM rubber in a polypropylene thermoplastic matrix, offering very good abrasion resistance, tensile strength, and memory so the seal rebounds reliably after every door cycle.
• Flame- and Moisture-Resistant: The neoprene compound is flame-resistant and moisture-resistant, maintaining sealing integrity in demanding building environments.
• Wide Temperature Range: Rated from -81°F to 275°F, making the 137NA suitable for exterior applications subject to extreme cold or heat loading.
• Ozone, Sunlight, and Aging Resistance: Good resistance to ozone, UV sunlight, and long-term aging keeps the bulb pliable and effective throughout the door assembly's service life.
• UL Fire-Door Certified (Standard Pressure): Certified by UL to CAN/ULC-S104 and ANSI/UL10B; complies with NFPA 80 and NFPA 252 for hollow metal fire doors rated up to 3 hours and wood fire doors rated up to 90 minutes.
• UL Positive Pressure Certified: Certified by UL to ANSI/UL10C; complies with IBC, NFPA 80, and NFPA 252 for hollow metal fire doors rated up to 3 hours and wood fire doors rated up to 90 minutes.
• Smoke and Draft Control Gasketing: Certified by UL to ANSI/UL10C and ANSI/UL1784 Category 'H'; complies with IBC and NFPA 105 for use on 'S'-labeled positive pressure hollow metal fire doors rated up to 3 hours and wood fire doors rated up to 90 minutes.
• BHMA Certified Performance: Certified to ANSI/BHMA A156.22 performance tests for heat and cold, and listed in the BHMA Certified Products Directory.
• Air Infiltration Control: Recommended for minimum air leakage and a tight perimeter seal around commercial door openings.
• Stainless Steel Fasteners Furnished: #6 x 3/4" stainless steel sheet metal screws are included with every set.
• Slotted Screw Holes: Factory-slotted screw holes allow field adjustment for precise fit against the door face.
• Five Standard Opening Sizes: Available as a complete head-and-jamb set in 3'0 x 7'0, 4'0 x 7'0, 6'0 x 7'0, 6'0 x 8'0, and 8'0 x 8'0 configurations.

Technical Details

Pro-Tip for Perimeter Sealing

The NGP 137NA is surface-applied directly to the frame stop on the head and both jambs, forming a continuous neoprene bulb seal around the full door perimeter. The factory-slotted screw holes allow you to shift the retainer slightly during installation so the bulb makes consistent contact with the door face before you lock down the furnished #6 x 3/4" stainless steel sheet metal screws. For fire-rated and smoke-listed openings, verify that the door and frame assembly carry the appropriate UL label to match the 137NA's certifications — the weatherstrip alone does not confer a fire rating on an unlisted opening.