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Pemko 303AS Standard Perimeter Gasketing with Silicone Insert
The Pemko 303AS is an architectural-grade rigid jamb weatherstrip designed to provide a high-performance seal around the perimeter of commercial door openings. It features a durable aluminum housing equipped with a Silicone (S3) insert, making it an exceptional barrier against smoke, air infiltration, and fire. This gasketing is engineered to seal gaps up to the depth of the insert, ensuring a snug, compliant fit for listed steel frames and wood core doors.
High-Performance & Life Safety Features
- Advanced Silicone (S3) Seal: The silicone insert offers superior flexibility and durability compared to standard vinyl, ensuring it won't crack or degrade under extreme temperatures.
- Positive Pressure Fire Rated: Fully tested and approved under UL 10C and UL 1784 standards, making it suitable for steel doors rated up to 3 hours and wood doors up to 20 minutes.
- Smoke & Air Protection: Effectively blocks the passage of lethal smoke and hot gases, meeting the stringent requirements for smoke door assemblies.
- Stainless Steel Fasteners: Supplied with standard stainless steel screws, providing maximum corrosion resistance and a secure, long-lasting installation.
- Low Air Infiltration: Rigorously tested for air leakage, this gasketing improves building energy efficiency by preventing drafts and conditioned air loss.
Technical Specifications
- Manufacturer: Pemko (ASSA ABLOY)
- Model: 303AS (Mill Finish Aluminum with Silicone Insert)
- Category Rating: Category J (Fire and Smoke)
- Certifications: BHMA Certified, GREENGUARD Gold, and Underwriters Laboratory 4L10.
- Application: Surface-applied to the stop of the frame; suitable for hollow metal and wood door assemblies.
Pro-Tip for Commercial Compliance
The Pemko 303AS is the industry standard for remediation when a door frame has excessive gaps that prevent a proper fire or smoke seal. For a professional installation, ensure the aluminum housing is mitered correctly at the corners to provide a continuous, unbroken seal. The silicone insert is available in both black and white to best match your facility's aesthetic requirements.
| Gasketing Set Size | 3'0 x 7'0 Set or 6'0 x 7'0 Set |
| Brand | Pemko |
| Insert Material | Silicone |
| Housing Finish | Aluminum |
| Weatherstripping Type | Perimeter Gasketing |
| Fire Rated | Fire Rated |
| Smoke Rated | Smoke Rated |
| Mounting Type | Screw Applied - Exp Screw, Surface Mounted |
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