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National Guard Products 120N DKB Neoprene Sponge Perimeter Weatherstrip Head-and-Jamb Set – Dark Bronze
National Guard Products (NGP) model 120N DKB is a neoprene sponge perimeter weatherstrip head-and-jamb set finished in Dark Bronze anodized aluminum with a black closed-cell EPDM neoprene sponge insert. Each set ships as one head piece and two jamb pieces — sized to fit your opening — and mounts directly to the frame stop with furnished stainless steel screws. The NGP 120N DKB is engineered for commercial hollow metal and wood door perimeters where fire-rated performance, smoke and draft control, air infiltration reduction, and long-term weathering resistance are all required. This is a made-to-order product available in five standard opening sizes, with a typical lead time of 10–15 business days.
High-Performance Perimeter Weatherstrip Features
- Patent-Pending Microcellular EPDM Insert: NGP's advanced elastomeric foam is engineered in a synthetic EPDM rubber in polypropylene thermoplastic matrix closed-cell structure, delivering exceptional compression recovery and a consistent perimeter seal across the full door opening.
- Aluminum Alloy 6063-T5 Extrusion: The carrier profile is extruded from Alloy 6063 in T5 temper — a commercial-grade aluminum alloy widely specified for door hardware for its strength-to-weight ratio and dimensional stability.
- Dark Bronze Finish: The Dark Bronze (DKB) finish provides a rich, deep tone that coordinates with Dark Bronze door frames and hardware for a unified commercial entrance appearance.
- Very Good Abrasion Resistance, Tensile Strength, and Memory: The neoprene sponge insert resists deformation over repeated door cycles, maintaining its profile and seal effectiveness in high-traffic commercial openings.
- Flame-Resistant and Moisture-Resistant Construction: The insert material is both flame-resistant and moisture-resistant, supporting fire-rated door assembly integrity and long service life in demanding environments.
- Wide Operating Temperature Range: Rated from -81°F to 275°F, the EPDM insert remains flexible and functional across extreme climate conditions, making the 120N DKB appropriate for cold-storage, exterior, and high-temperature adjacent applications.
- Good Resistance to Ozone, Sunlight, and Aging: EPDM is inherently resistant to UV exposure, ozone degradation, and environmental aging, reducing the need for premature replacement in exterior or sun-exposed openings.
- UL Certified for Fire-Rated Hollow Metal and Wood Doors: Certified by UL to CAN/ULC-S104 and ANSI/UL 10B, compliant 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 Door Certified: Certified by UL to ANSI/UL 10C, compliant with IBC, NFPA 80, and NFPA 252 for positive pressure applications on hollow metal doors rated up to 3 hours and wood doors rated up to 90 minutes.
- Smoke and Draft Control Gasketing: Certified by UL 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 rated up to 3 hours and wood fire doors rated up to 90 minutes.
- ANSI/BHMA A156.22 Certified Gasketing: Certified to the American National Standard for Door Gasketing and Edge Sealing Systems and listed in the BHMA Certified Products Directory, including performance testing for heat and cold.
- Recommended for Air Infiltration Reduction: NGP designates the 120N as a recommended product for minimum air leakage and a tight perimeter seal around commercial door openings.
- Slotted Screw Holes for Field Adjustment: Screw holes are slotted so installers can fine-tune the strip's position against the door face for an optimized seal without rework.
- Stainless Steel Fasteners Furnished: Each set includes #6 x 3/4" stainless steel sheet metal screws — corrosion-resistant fasteners appropriate for exterior and high-humidity applications.
- Head-and-Jamb Set — Five Opening Sizes Available: Supplied as a complete three-piece set (one head, two jambs) cut to your specified opening size; available for five standard commercial door openings from 3'0 x 7'0 through 8'0 x 8'0.
Technical Details
| Manufacturer | National Guard Products (NGP) |
| Model Number | 120N DKB |
| Product Type | Perimeter Weatherstrip Head-and-Jamb Set |
| Finish | Dark Bronze (DKB) |
| Insert Material | Black Closed-Cell EPDM Neoprene Sponge (Patent-Pending Microcellular EPDM in Polypropylene Thermoplastic Matrix) |
| Insert Color | Black |
| Carrier Material | Aluminum Alloy 6063, T5 Temper |
| Profile Section (Typical) | 5/8" x 3/16" |
| Application Method | Screw applied to the frame stop |
| Fasteners Furnished | #6 x 3/4" Stainless Steel Sheet Metal Screws |
| Screw Hole Type | Slotted for field adjustment |
| Set Configuration | 1 Head + 2 Jambs (3-piece perimeter set) |
| 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 / Tensile / Memory | Very Good |
| UL Fire-Door Certification (Standard Pressure) | Certified by UL to CAN/ULC-S104 and ANSI/UL 10B; complies with NFPA 80 and NFPA 252 — Hollow Metal up to 3 Hrs., Wood up to 90 Min. |
| UL Fire-Door Certification (Positive Pressure) | Certified by UL to ANSI/UL 10C; complies with IBC, NFPA 80, and NFPA 252 — Hollow Metal up to 3 Hrs., Wood up to 90 Min. |
| Smoke and Draft Control | Certified by UL to ANSI/UL 10C and ANSI/UL 1784 Category 'H'; complies with IBC and NFPA 105 — 'S'-labeled Positive Pressure Hollow Metal up to 3 Hrs., Wood up to 90 Min. |
| BHMA Certification | ANSI/BHMA A156.22 Certified; listed in BHMA Certified Products Directory; BHMA Certified for Heat and Cold Performance Tests |
| Air Infiltration | NGP-recommended product for minimum air leakage and tight perimeter seal |
| Availability | Made to Order |
| Lead Time | 10–15 Business Days |
Pro-Tip for Perimeter Sealing
The NGP 120N DKB is designed for surface application directly to the frame stop, making it straightforward to install on new or replacement commercial door frames without routing or mortising. The slotted screw holes allow you to shift the strip laterally before final tightening so the neoprene sponge contacts the door face evenly across the full head and both jambs. All necessary #6 x 3/4" stainless steel sheet metal screws are furnished with the set — no separate fastener order required. Because this is a three-piece head-and-jamb set cut to your specified opening size, confirm your rough opening dimensions before ordering, as this product is made to order with a 10–15 business-day lead time.
| 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 | 5/8" x 3/16" |
| 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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