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National Guard Products 135N DKB Neoprene Bulb Perimeter Weatherstrip Head-and-Jamb Set, Dark Bronze
National Guard Products (NGP) model 135N DKB is a neoprene bulb perimeter weatherstrip head-and-jamb set finished in Dark Bronze aluminum with a black neoprene bulb insert. Each set includes one head piece and two jamb pieces, sized to fit the full perimeter of a door opening and screw-applied directly to the frame stop. The 7/8" x 5/16" aluminum extrusion houses a synthetic EPDM rubber bulb in a polypropylene thermoplastic matrix, compressing against the door face to create a continuous, airtight seal around the head and both jambs. NGP 135N DKB is available to order 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—and is made to order with a typical lead time of 10–15 business days. It carries UL fire-door listings for hollow metal doors rated up to 3 hours and wood doors rated up to 90 minutes, including positive-pressure and smoke-and-draft-control certifications, making it a code-compliant choice for commercial, institutional, and high-performance building applications.
High-Performance Neoprene Bulb Perimeter Weatherstrip Features
- Dark Bronze Aluminum Extrusion: Formed from Aluminum Alloy 6063, T5 temper for a rigid, corrosion-resistant carrier that coordinates with Dark Bronze door frames and hardware finishes.
- EPDM Neoprene Bulb Insert: Synthetic EPDM rubber in a polypropylene thermoplastic matrix delivers very good abrasion resistance, tensile strength, and memory so the bulb rebounds to its original profile after each door cycle.
- Extreme Temperature Performance: Rated from -81°F to 275°F, keeping the seal pliable and effective in cold storage, exterior, and high-heat environments without cracking or deforming.
- Flame- and Moisture-Resistant Compound: The neoprene formulation resists flame spread and moisture absorption, supporting fire-rated-door applications and exterior or high-humidity openings.
- Ozone, Sunlight, and Aging Resistance: Good resistance to ozone, UV exposure, and long-term aging extends service life on exterior and daylit openings without premature deterioration of the bulb.
- UL Fire Door Certification (Standard and Positive Pressure): Certified by UL to CAN/ULC-S104, ANSI/UL10B, and ANSI/UL10C; 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.
- 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 up to 3 hours and wood fire doors up to 90 minutes.
- ANSI/BHMA A156.22 Certified: Listed in the BHMA Certified Products Directory and performance-tested to ANSI/BHMA A156.22 for heat and cold, confirming third-party verification of gasketing performance.
- Air Infiltration Control: Recommended by NGP for minimum air leakage and a tight perimeter seal, reducing drafts, energy loss, and outdoor noise transmission around the door.
- Stainless Steel Screws Furnished: #6 x 3/4" stainless steel sheet metal screws are included with each set for corrosion-resistant fastening that matches the longevity of the aluminum extrusion.
- Slotted Screw Holes for Field Adjustment: Screw holes are slotted so installers can shift the weatherstrip laterally to achieve optimal bulb compression against the door face without over-drilling or shimming.
- Made-to-Order Head-and-Jamb Set: Supplied as a matched set (1 head + 2 jambs) cut to the selected opening size, eliminating field cutting of the extrusion and ensuring consistent mitered or square-cut corners.
Technical Details
| Manufacturer | National Guard Products (NGP) |
| Model Number | 135N DKB |
| Product Type | Neoprene Bulb Perimeter Weatherstrip Head-and-Jamb Set |
| Finish | Dark Bronze |
| Insert / Seal Material | Synthetic EPDM Rubber in Polypropylene Thermoplastic Matrix (Black) |
| Carrier Material | Aluminum Alloy 6063, T5 Temper |
| Profile Section Size | 7/8" x 5/16" |
| Set Configuration | 1 Head + 2 Jambs (full 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 |
| Application Method | Screw-applied to frame stop |
| Fasteners Furnished | #6 x 3/4" Stainless Steel Sheet Metal Screws |
| Screw Hole Type | Slotted for field adjustment |
| 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 Listing | Certified by UL to CAN/ULC-S104 and ANSI/UL10B; complies with NFPA 80 and NFPA 252 — Hollow Metal up to 3 hrs., Wood up to 90 min. |
| UL Positive Pressure Listing | Certified by UL to ANSI/UL10C; complies with IBC, NFPA 80 and NFPA 252 — Hollow Metal up to 3 hrs., Wood 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 doors, Hollow Metal up to 3 hrs., Wood up to 90 min. |
| BHMA Certification | ANSI/BHMA A156.22 Certified; listed in BHMA Certified Products Directory |
| Availability | Made to Order |
| Lead Time | 10–15 Business Days |
Pro-Tip for Perimeter Sealing
The NGP 135N DKB mounts directly to the face of the frame stop using the furnished #6 x 3/4" stainless steel sheet metal screws. Before final tightening, take advantage of the slotted screw holes to shift the extrusion inward or outward until the neoprene bulb makes consistent, even contact with the door face along the full length of the head and both jambs. Achieving uniform bulb compression—without over-compressing or leaving gaps—is the key to maximizing air infiltration control and preserving the integrity of the fire and smoke ratings. Install the head piece first, then fit the jamb pieces to butt tightly at the corners before driving screws to final torque.
| 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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