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National Guard Products 137N DKB Neoprene Bulb Perimeter Weatherstrip Set – Dark Bronze
The National Guard Products (NGP) 137N Dark Bronze Neoprene Bulb Perimeter Weatherstrip is a premium, screw-applied head-and-jamb perimeter seal set engineered to deliver airtight, fire-rated, and smoke-resistant door perimeter protection on commercial hollow metal and wood doors. Each set includes one head piece and two jamb pieces, surface applied to the frame stop with furnished #6 x 3/4" stainless steel sheet metal screws, 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. The extruded Aluminum Alloy 6063-T5 carrier profile is finished in a Dark Bronze (DKB) anodized-style finish, while the compression seal itself features a black neoprene bulb insert — a synthetic EPDM rubber compound in a polypropylene thermoplastic matrix — delivering long-lasting memory, abrasion resistance, and reliable perimeter closure across a wide temperature range. This is a made-to-order product with an estimated lead time of 10–15 business days.
High-Performance Perimeter Weatherstrip Features
- Fire-Rated for Hollow Metal & Wood Doors: UL Certified to CAN/ULC-S104 and ANSI/UL 10B, complying 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.
- Positive Pressure Fire Rating: UL Certified to ANSI/UL 10C, complying with IBC, NFPA 80, and NFPA 252 for positive pressure application on hollow metal doors up to 3 hours and wood doors up to 90 minutes.
- Smoke & Draft Control Gasketing: UL Certified to ANSI/UL 10C and ANSI/UL 1784 Category 'H', compliant 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.
- BHMA Certified Performance: Certified and listed in the BHMA Certified Products Directory per ANSI/BHMA A156.22, including performance testing for heat and cold resistance.
- Exceptional Temperature Range: Neoprene bulb performs reliably from -81°F to 275°F, making it suitable for extreme climate and high-traffic commercial applications.
- Durable Neoprene Bulb Insert: Synthetic EPDM rubber in a polypropylene thermoplastic matrix provides very good abrasion resistance, tensile strength, and compression memory for a consistent, lasting seal.
- Environmental Resistance: The neoprene compound offers good resistance to ozone, sunlight, and aging, as well as being both flame-resistant and moisture-resistant — essential qualities for exterior-facing commercial door frames.
- Air Infiltration Control: Recommended by NGP as a product for minimum air leakage and a tight seal around the complete door perimeter.
- Slotted Screw Holes for Field Adjustment: Screw holes are slotted to allow on-site positioning adjustments for a precise, gap-free fit against varying door tolerances.
- Stainless Steel Fasteners Included: Each set is furnished with #6 x 3/4" stainless steel sheet metal screws for corrosion-resistant, long-term fastening.
- Head-and-Jamb Set Convenience: Sold as a complete three-piece perimeter set (1 head + 2 jambs) cut to the specified opening size, reducing field measuring and cutting time.
- Dark Bronze Finish: The aluminum extrusion carrier is finished in Dark Bronze (DKB), coordinating with dark bronze door hardware and frame finishes common in commercial and institutional architectural specifications.
Technical Details
| Manufacturer | National Guard Products (NGP) |
| Model Number | 137N DKB |
| Product Type | Neoprene Bulb Perimeter Weatherstrip – Head-and-Jamb Set |
| Finish | Dark Bronze (DKB) |
| Insert / Seal Material | Black Neoprene Bulb – Synthetic EPDM Rubber in Polypropylene Thermoplastic Matrix |
| Carrier / Frame Material | Aluminum Alloy 6063, T5 Temper |
| Typical Profile Section | 7/8" x 5/16" |
| Application Method | Screw Applied to Frame Stop |
| Set Configuration | 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 |
| Fasteners Furnished | #6 x 3/4" Stainless Steel Sheet Metal Screws |
| Screw Holes | Slotted for Field Adjustment |
| Temperature Range | -81°F to 275°F |
| Abrasion Resistance | Very Good |
| Tensile Strength | Very Good |
| Compression Memory | Very Good |
| Flame Resistance | Yes |
| Moisture Resistance | Yes |
| Ozone / Sunlight / Aging Resistance | Good |
| UL Fire Rating – Standard Pressure | CAN/ULC-S104 & ANSI/UL 10B; Hollow Metal up to 3 Hrs., Wood up to 90 Min. (NFPA 80 & NFPA 252) |
| UL Fire Rating – Positive Pressure | ANSI/UL 10C; Hollow Metal up to 3 Hrs., Wood up to 90 Min. (IBC, NFPA 80 & NFPA 252) |
| Smoke & Draft Control | UL Certified – ANSI/UL 10C & ANSI/UL 1784 Category 'H'; 'S' Label Positive Pressure Hollow Metal up to 3 Hrs., Wood up to 90 Min. (IBC & NFPA 105) |
| BHMA Certification | ANSI/BHMA A156.22 – Listed in BHMA Certified Products Directory |
| Stock Status | Made to Order |
| Lead Time | Approximately 10–15 Business Days |
Pro-Tip for Perimeter Sealing
The NGP 137N DKB is designed to be surface applied directly to the frame stop, making installation straightforward on both new construction and retrofit projects. The slotted screw holes allow the installer to shift the weatherstrip laterally before final tightening, ensuring the neoprene bulb compresses evenly against the door face for a consistent, gap-free perimeter seal. Use the furnished #6 x 3/4" stainless steel sheet metal screws to prevent corrosion at the fastener points over time. When ordering, confirm your opening size from the five available configurations — the set is pre-cut to length and arrives ready to install, eliminating on-site cutting of the aluminum extrusion.
| 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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