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National Guard Products 137SA Silicone Smoke-Rated Astragal Set – Anodized Aluminum
National Guard Products (NGP) Model 137SA Silicone Smoke-Rated Astragal Set delivers certified fire, smoke, and draft control protection at the meeting edge of paired doors. This two-piece meeting-edge astragal set is constructed with an Aluminum Alloy 6063-T5 extruded body in an Anodized Aluminum finish and a dense black silicone synthetic rubber polymer seal engineered to remain flexible across an extreme temperature range of -81°F to 300°F. Sold as a set of two pieces in 84-inch or 96-inch piece heights, the 137SA is a made-to-order product with a typical lead time of 10–15 business days. It is UL-certified for Positive Pressure applications, qualifies as ANSI/UL1784 Category 'H' Smoke & Draft Control Gasketing, and is compliant with IBC, NFPA 80, NFPA 105, and NFPA 252 — making it an authoritative solution for architects, door contractors, and facility managers specifying fire-rated door assemblies.
137SA Silicone Astragal Set – Key Features & Benefits
- Dense Black Silicone Seal: Synthetic rubber polymer construction provides excellent flexibility and memory, maintaining a consistent compression seal at the meeting edge of paired doors even after repeated door cycles.
- Extreme Temperature Performance: Rated from -81°F to 300°F, the silicone compound remains pliable and effective in both sub-zero cold-storage environments and high-heat fire-door conditions where rigid seals would fail.
- Flame-Resistant & Moisture-Resistant: The silicone polymer resists ignition, moisture intrusion, ozone degradation, UV exposure, and long-term aging — preserving seal integrity throughout the life of the door assembly.
- FM200 & Halon System Compatible: Specifically recommended for rooms and corridors protected by FM200 or Halon fire suppression systems, where chemical exposure resistance of the seal material is critical.
- UL-Certified Fire & Positive Pressure Rating: Certified by UL to ANSI/UL10B (CAN/ULC-S104) and ANSI/UL10C for Hollow Metal fire doors rated up to 3 hours and Wood fire doors rated up to 90 minutes under both standard and Positive Pressure conditions.
- Smoke & Draft Control – ANSI/UL1784 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 up to 3 hours and Wood fire doors up to 90 minutes.
- NFPA 80 & NFPA 252 Compliant: Meets the requirements of NFPA 80 and NFPA 252 for fire door hardware, supporting code-compliant fire door assembly specifications on new construction and renovation projects.
- Aluminum Alloy 6063-T5 Body: The extruded aluminum carrier profile provides structural rigidity and corrosion resistance while the Anodized Aluminum finish coordinates with standard commercial door hardware and hollow metal frame finishes.
- Slotted Screw Holes for Field Adjustment: Pre-slotted mounting holes allow the installer to fine-tune the astragal position at the meeting edge for optimal seal compression without drilling additional holes.
- Stainless Steel Fasteners Furnished: #6 × 3/4-inch Stainless Steel Sheet Metal Screws are included with each set, providing corrosion-resistant attachment hardware matched to the aluminum body.
- Two-Piece Meeting-Edge Set: Ordered as a set to receive two pieces — one astragal for each active and inactive leaf — ensuring a properly matched and gapped seal at the door meeting edge.
- Air Infiltration Control: Recommended by NGP for minimum air leakage, supporting energy code compliance and conditioned-space integrity in commercial buildings.
Technical Details
| Manufacturer | National Guard Products (NGP) |
| Model Number | 137SA |
| Product Type | Two-Piece Meeting-Edge Silicone Smoke-Rated Astragal Set |
| Finish | Anodized Aluminum |
| Seal Material | Dense Black Silicone Synthetic Rubber Polymer |
| Body Material | Aluminum Alloy 6063, T5 Temper |
| Typical Section Profile | 7/8" × 5/16" |
| Available Piece Heights | 84 inch, 96 inch |
| Pieces Per Set | 2 (order as set to receive two pieces) |
| Temperature Range | -81°F to 300°F |
| Fasteners Furnished | #6 × 3/4" Stainless Steel Sheet Metal Screws |
| Screw Hole Type | Slotted for field adjustment |
| UL Certifications | ANSI/UL10B (CAN/ULC-S104), ANSI/UL10C, ANSI/UL1784 Category 'H' |
| Fire Door Rating – Hollow Metal | Up to 3 Hours |
| Fire Door Rating – Wood | Up to 90 Minutes |
| Standards Compliance | IBC, NFPA 80, NFPA 105, NFPA 252 |
| Smoke & Draft Control Classification | ANSI/UL1784 Category 'H' – 'S'-Labeled Positive Pressure Fire Doors |
| Fire Suppression Compatibility | Recommended for FM200 and Halon Fire Suppression Systems |
| Flame Resistance | Yes |
| Moisture Resistance | Yes |
| UV & Ozone Resistance | Yes |
| Availability | Made to Order — 10–15 Business Day Lead Time |
Pro Installation Tips
Meeting-Edge Gap Requirement: IBC, NFPA 80, NFPA 105, and NFPA 252 require that the gap at the meeting edge between fire-labeled doors must not exceed 1/8 inch. Verify this clearance before and after astragal installation. Slotted screw holes on the 137SA allow field adjustment so the seal contacts the opposing leaf correctly without over-compression. #6 × 3/4-inch Stainless Steel Sheet Metal Screws are furnished with the set; use the provided hardware to maintain listing compliance. Because this is a two-piece set, both pieces must be installed — one on each door leaf at the meeting edge — to achieve the certified smoke, draft, and fire seal. Important: Fire-rated astragal seals cannot replace any astragal required on the door by the door manufacturer to maintain its fire label. Always consult the door manufacturer's listing requirements before specifying or installing this product on a labeled fire door assembly.
| Length | 84 Inch or 96 Inch |
| Brand | National Guard Products |
| Housing Finish | Aluminum |
| 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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