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National Guard Products 131NDKB Neoprene Bulb Perimeter Weatherstrip Head-and-Jamb Set – Dark Bronze
The National Guard Products (NGP) 131NDKB is a Neoprene Bulb Perimeter Weatherstrip supplied as a complete head-and-jamb set (one head piece plus two jamb pieces) in a Dark Bronze finish with a black neoprene bulb insert. Engineered for commercial and institutional openings, this screw-applied perimeter seal attaches directly to the door frame stop and is available in five standard opening sizes — 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 — making it a versatile solution for single and double doors as well as oversized hollow metal and wood-door assemblies. It carries UL certification for fire-rated door applications up to 3 hours on hollow metal and up to 90 minutes on wood doors, and it is ANSI/BHMA A156.22 certified for gasketing performance, delivering a tight perimeter seal against air infiltration, smoke, and draft on positive-pressure fire-door assemblies.
High-Performance Neoprene Bulb Perimeter Weatherstrip Features
- Aluminum Alloy 6063-T5 Retainer: Aircraft-grade alloy extrusion provides a rigid, corrosion-resistant carrier that holds its profile under repeated door cycles and heavy commercial use.
- EPDM Neoprene Bulb Insert in Polypropylene Thermoplastic Matrix: The black synthetic EPDM rubber bulb delivers very good abrasion resistance, tensile strength, and memory, maintaining a resilient seal over the life of the door.
- Extreme Temperature Range (−81°F to 275°F): Rated for severe environmental conditions, making this perimeter seal suitable for cold-storage facilities, industrial buildings, and high-heat corridors.
- Flame-Resistant and Moisture-Resistant Bulb: The neoprene compound resists ignition and moisture intrusion, critical performance attributes on rated fire-door assemblies.
- Good Resistance to Ozone, Sunlight, and Aging: EPDM chemistry naturally resists UV degradation and atmospheric ozone, extending the service life of the seal in exterior and semi-exterior exposures.
- UL Certified — Fire Door Rated Up to 3 Hours (Hollow Metal) / 90 Minutes (Wood): Certified by UL to CAN/ULC-S104 and ANSI/UL10B (standard pressure), and to ANSI/UL10C (positive pressure); complies with NFPA 80, NFPA 252, and IBC requirements for fire-rated openings.
- Smoke & Draft Control Gasketing — UL Category 'H': Certified 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 up to 3 hours and wood fire doors up to 90 minutes.
- ANSI/BHMA A156.22 Certified Gasketing: Independently certified and listed in the BHMA Certified Products Directory, verifying compliance with BHMA performance tests for heat and cold.
- Minimum Air Leakage Performance: Recommended by the manufacturer as a product for minimum air leakage and a tight perimeter seal, reducing energy loss and pressure differential at the door opening.
- Complete Head-and-Jamb Set: Each order includes one head piece and two jamb pieces cut to the specified opening size, simplifying procurement and ensuring a matched, continuous perimeter seal.
- Five Opening Sizes Available: Offered 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 to cover standard single doors, wide single doors, double doors, and oversized openings.
- Dark Bronze Anodized-Effect Finish: The Dark Bronze (DKB) aluminum retainer coordinates with dark bronze door frames and hardware for a finished, architectural appearance.
Technical Details
| Manufacturer | National Guard Products (NGP) |
| Model Number | 131NDKB |
| Product Type | Neoprene Bulb Perimeter Weatherstrip — Head-and-Jamb Set |
| Finish | Dark Bronze (DKB) |
| Bulb Insert Material | Synthetic EPDM Rubber in Polypropylene Thermoplastic Matrix — Black |
| Retainer Material | Aluminum Alloy 6063, T5 Temper |
| Typical Section Profile | 7/8" x 5/16" |
| Application | Screw-applied to door frame stop (perimeter seal) |
| Set Contents | 1 Head piece + 2 Jamb pieces |
| Available Opening Sizes | 3'0 x 7'0 / 4'0 x 7'0 / 6'0 x 7'0 / 6'0 x 8'0 / 8'0 x 8'0 |
| Temperature Range | −81°F to 275°F |
| Flame Resistance | Flame-Resistant |
| Moisture Resistance | Moisture-Resistant |
| Environmental Resistance | Good resistance to ozone, sunlight, and aging |
| Abrasion Resistance | Very Good |
| Tensile Strength / Memory | Very Good |
| UL Certification — Standard Pressure | Certified by UL to CAN/ULC-S104 and ANSI/UL10B; complies with NFPA 80 and NFPA 252 — Hollow Metal fire doors up to 3 hrs.; Wood fire doors up to 90 min. |
| UL Certification — Positive Pressure | Certified by UL to ANSI/UL10C; complies with IBC, NFPA 80 and NFPA 252 — Hollow Metal fire doors up to 3 hrs.; Wood fire doors up to 90 min. |
| Smoke & Draft Control | Certified by UL to ANSI/UL10C and ANSI/UL1784 Category 'H'; complies with IBC and NFPA 105 — 'S'-labeled positive-pressure Hollow Metal fire doors up to 3 hrs.; Wood fire doors up to 90 min. |
| BHMA Certification | ANSI/BHMA A156.22 Certified — listed in BHMA Certified Products Directory; performance tested for heat and cold |
| Fasteners Furnished | #6 x 3/4" Stainless Steel Sheet Metal Screws |
| Screw Holes | Slotted for field adjustment |
| Availability | Made to Order — Lead time approximately 10–15 business days |
Pro-Tip for Perimeter Sealing
The NGP 131NDKB is designed for surface application directly to the door frame stop. The furnished #6 x 3/4" stainless steel sheet metal screws install through slotted screw holes in the aluminum retainer, allowing you to shift the strip laterally after initial fastening to fine-tune bulb compression and achieve the most consistent contact with the door face across the full height of the jambs and width of the head. For rated assemblies, always verify that the complete perimeter — head, latch jamb, and hinge jamb — is sealed with the same UL-listed gasketing system, as partial installation may void the fire-door listing.
| Gasketing Set Size | 3'0 x 7'0 Set or 4'0 x 7'0 Set or 6'0 x 7'0 Set or 6'0 x 8'0 Set or 8'0 x 8'0 Set |
| Brand | National Guard Products |
| Housing Finish | Dark Bronze |
| Smoke Rated | Smoke Rated |
| Weatherstripping Type | Perimeter Gasketing |
| Housing Size | 7/8" x 5/16" |
| Insert Color | Black |
| Fasteners | #6 x 3/4" Stainless Steel Sheet Metal Screws Furnished |
| Fire Rated | Fire Rated |
| Insert Material | Neoprene |
| Mounting Type | Screw Applied - Exp Screw, Surface Mounted |
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