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National Guard Products 137S DKB Silicone Smoke-Rated Astragal Set – Dark Bronze, Two-Piece Meeting-Edge Set
National Guard Products (NGP) model 137S, offered here as a two-piece Dark Bronze silicone smoke-rated astragal set, is engineered to seal the meeting edge of a pair of doors against smoke, draft, and flame. Each set ships as two individual astragal pieces — one applied to each active and inactive door leaf — in your choice of 84-inch or 96-inch piece height. The dense black silicone bulb is bonded to a Dark Bronze (DKB) finished aluminum alloy 6063-T5 carrier, delivering a flame-resistant, moisture-resistant, and temperature-stable seal that satisfies the most demanding fire- and smoke-rated door assembly requirements. This is a made-to-order product with a typical lead time of 10–15 business days.
Features of the NGP 137S Dark Bronze Silicone Meeting-Edge Astragal Set
- UL-Certified Fire Rating – Up to 3 Hours: Certified by UL to CAN/ULC-S104 and ANSI/UL10B; 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.
- Positive-Pressure Fire Rating: Certified by UL to ANSI/UL10C; complies with IBC, NFPA 80, and NFPA 252 for hollow metal fire doors rated up to 3 hours and wood fire doors rated up to 90 minutes under positive-pressure conditions.
- Smoke & Draft Control Gasketing – UL Category H: 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 rated up to 3 hours and wood fire doors rated up to 90 minutes.
- Aluminum Alloy Carrier with Dark Bronze Finish: Extruded from Aluminum Alloy 6063, T5 Temper with a factory-applied Dark Bronze finish that coordinates with popular commercial door hardware.
- Dense Black Silicone Seal: The bulb gasket is a synthetic rubber polymer silicone compound offering excellent flexibility and memory, ensuring consistent compression and recovery at the meeting edge.
- Extreme Temperature Performance: Rated from -81°F to +300°F; remains flexible at extreme temperatures without hardening or cracking.
- Weather and Environmental Durability: Flame-resistant, moisture-resistant, and provides excellent resistance to ozone, UV exposure, and aging — ideal for high-traffic and exterior-adjacent door pairs.
- FM200 / Halon Compatible: Recommended for areas utilizing FM200 or Halon fire suppression systems, where chemical resistance of the seal material is critical.
- Slotted Screw Holes for Field Adjustment: Mounting holes are slotted to allow fine-tuning of the astragal position at the meeting edge after installation.
- Stainless Steel Fasteners Included: Each piece is furnished with #6 × 3/4-inch stainless steel sheet metal screws — no additional hardware purchase required.
- Two-Piece Set – One per Leaf: Ordering as a set provides two astragal pieces, one for each door leaf of the pair.
- Air Infiltration Control: Recommended by NGP as a minimum air-leakage product for a tight seal at the meeting edge of paired doors.
Technical Details
| Manufacturer | National Guard Products (NGP) |
| Model Number | 137S DKB |
| Product Type | Two-Piece Meeting-Edge Silicone Smoke-Rated Astragal Set |
| Finish | Dark Bronze (DKB) |
| Carrier Material | Aluminum Alloy 6063, T5 Temper |
| Seal Material | Dense Black Silicone (Synthetic Rubber Polymer) |
| Section Profile | 7/8" × 5/16" |
| Available Piece Heights | 84 inch and 96 inch |
| Pieces per Set | Two (one per door leaf) |
| Fasteners Furnished | #6 × 3/4" Stainless Steel Sheet Metal Screws |
| Screw Holes | Slotted for field adjustment |
| Temperature Range | -81°F to +300°F |
| Fire Door Rating – Hollow Metal | Up to 3 Hours (UL Certified) |
| Fire Door Rating – Wood | Up to 90 Minutes (UL Certified) |
| UL Certifications | CAN/ULC-S104, ANSI/UL10B, ANSI/UL10C, ANSI/UL1784 Category 'H' |
| Compliance Standards | IBC, NFPA 80, NFPA 105, NFPA 252 |
| Positive Pressure Rated | Yes – Certified to ANSI/UL10C |
| Smoke & Draft Control | Yes – UL Category 'H' |
| Fire Suppression Compatibility | Recommended for FM200 and Halon systems |
| Availability | Made to Order – 10 to 15 business day lead time |
Pro Tip: Because IBC, NFPA 80, NFPA 105, and NFPA 252 require that the meeting-edge gap between fire-labeled doors must not exceed 1/8 inch, verify the gap on your door pair before specifying astragal height and profile. The slotted mounting holes on the 137S allow precise lateral adjustment at the job site to achieve proper compression of the silicone bulb. Important: fire-rated astragal seals cannot replace any astragal required on the door by the door manufacturer to maintain its fire label — always confirm the door manufacturer's requirements before installation. Each set includes two pieces and all stainless steel mounting screws needed for a complete meeting-edge installation.
| Length | 84 Inch or 96 Inch |
| Brand | National Guard Products |
| Housing Finish | Dark Bronze |
| Smoke Rated | Smoke Rated |
| Weatherstripping Type | Astragal |
| Housing Size | 7/8" x 5/16" |
| Insert Color | Black |
| Fasteners | #6 x 3/4" Stainless Steel SMS |
| Set Type | Two-piece meeting-edge set |
| Fire Rated | Fire Rated |
| Insert Material | Silicone |
| Mounting Type | Screw Applied - Exp Screw, Surface Mounted |
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