National Guard Products 137SA Silicone Dense Bulb Perimeter Weatherstrip Head-and-Jamb Set – Anodized Aluminum

National Guard Products (NGP) model 137SA is a silicone dense bulb perimeter weatherstrip head-and-jamb set finished in anodized aluminum with a black dense silicone bulb insert. Each set ships as one head piece and two jamb pieces, cut to length for the specified opening, and is screw-applied directly to the frame stop. The 137SA is engineered to deliver an air-tight perimeter seal while carrying a full stack of UL fire-door and smoke-and-draft-control certifications, making it the right choice for hollow metal and wood fire-rated openings in commercial, institutional, and high-security facilities. Available in five standard opening sizes and made to order, this is a specification-grade product built to perform across extreme temperature swings, high-ozone environments, and spaces equipped with FM200 or Halon fire-suppression systems.

High-Performance Silicone Perimeter Weatherstrip Features

• Dense Silicone Bulb: Black synthetic rubber polymer delivers excellent flexibility and memory, maintaining a consistent seal cycle after cycle without permanent compression set.
• Extreme Temperature Range: Rated from -81°F to 300°F, the silicone bulb remains flexible at temperatures where vinyl or EPDM compounds may stiffen or crack, ensuring reliable performance in cold-storage corridors and high-heat mechanical rooms alike.
• Aluminum Alloy 6063-T5 Retainer: The extruded retainer combines light weight with corrosion resistance, and the anodized finish provides a clean, durable appearance suited to high-traffic commercial openings.
• FM200 and Halon Compatible: Specifically recommended for areas employing FM200 or Halon gaseous fire-suppression systems, where moisture-sensitive or reactive gasket materials are a liability.
• UL-Certified Fire and Smoke Control: Certified under ANSI/UL10B (fire) and ANSI/UL10C (positive pressure fire and smoke) for hollow metal fire doors rated up to 3 hours and wood fire doors rated up to 90 minutes; also UL-certified to CAN/ULC-S104 for Canadian applications.
• Smoke & Draft Category H: Certified by UL to ANSI/UL1784 Category ‘H’, complying 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.
• ANSI/BHMA A156.22 Certified: Certified to the American National Standard for Door Gasketing and Edge Sealing Systems and listed in the BHMA Certified Products Directory, including performance tests for heat and cold.
• NFPA 80 and NFPA 252 Compliance: Meets code requirements for fire door assemblies under both the Standard for Fire Doors and Other Opening Protectives and the Standard Methods of Fire Tests of Door Assemblies.
• Ozone, UV, and Aging Resistance: Silicone chemistry provides excellent resistance to environmental degradation, extending service life in exterior vestibules, curtain-wall entries, and sun-exposed openings.
• Moisture Resistance: Impervious to moisture absorption, preventing swelling, mold growth, or bond failure in high-humidity environments such as pool facilities, kitchens, and exterior entries.
• Flame Resistant: The silicone bulb carries flame-resistant properties consistent with its fire-door certification package.
• Stainless Steel Fasteners Furnished: #6 x 3/4" stainless steel sheet metal screws are included, providing corrosion-resistant attachment appropriate for interior and protected exterior applications.
• Slotted Screw Holes: Factory-slotted holes allow field adjustment of the retainer position for a precise, gap-free fit against the door face.
• Head-and-Jamb Set Format: Sold as a complete perimeter set (one head piece plus two jamb pieces) cut to the ordered opening size, eliminating the need to field-cut or source separate components.
• Made to Order: Custom cut to the specified opening; please allow 10–15 business days for production and shipment.

Technical Details

Pro-Tip for Perimeter Sealing

The 137SA installs surface-applied to the face of the frame stop, with the dense silicone bulb compressing against the door face as the door closes. Before fastening, use the factory-slotted screw holes to slide the retainer inward or outward until the bulb makes even contact along the full height and width of the door. Drive the furnished #6 x 3/4" stainless steel sheet metal screws snugly but not so tightly that the retainer bows — a bowed retainer creates high and low spots in bulb pressure and can compromise both the air seal and the fire-door rating. Install the head piece last, overlapping or mitering the top corners to close any gap between the head and jamb runs. Because the silicone remains flexible from -81°F to 300°F and resists ozone and UV degradation, no seasonal adjustment is typically required after the initial set.