Pemko 303 Fire-Rated Perimeter Gasketing with Insert – 1-1/8″; x 1/4″Professional Fire-Rated Door Sealing SolutionThe Pemko 303 Standard Perimeter Gasketing provides Category J gasket performance for listed steel frames and classified doors with fire ratings up to 3 hours for steel doors, 1-1/2 hours for wood and plastic covered composite doors, and 20 minutes for wood core doors. This rigid jamb weatherstrip features 1-1/8″; x 1/4″; aluminum construction with silicone insert and can seal gaps up to the depth of its seal from standard 1/16″; openings. UL10C Positive Pressure fire rated and GREENGUARD Gold certified for superior performance and environmental safety.Professional Features & BenefitsPrecision Dimensions: 1-1/8″; height x 1/4″; width aluminum profile designed for standard 1/16″; gaps with sealing capability up to full seal depth.Multi-Hour Fire Rating: UL10C Positive Pressure fire rated for steel doors up to 3 hours, composite doors up to 1-1/2 hours, and wood core doors for 20 minutes.Durable Aluminum Construction: Rigid aluminum substrate with silicone insert provides long-lasting performance and weather resistance.Comprehensive Testing Certifications: Air infiltration tested, sound tested per ASTM E90, smoke tested UL1784, and BHMA certified for professional applications.Flexible Gap Sealing: Each weatherstrip can accommodate gaps up to the depth of its seal, providing versatile installation options.Environmental Certification: GREENGUARD Gold certified for low chemical emissions and indoor air quality.Premium Fastening System: Supplied with stainless steel fasteners as standard with alternative fastener options available.Manufacturer Warranty: 5 Year warranty coverage for added confidence and protection.Technical SpecificationsANSI/BHMA: Air Infiltration Tested, Sound Tested ASTM E90, BHMA Certified, Smoke Tested UL1784, Fire Rated UL10C Positive Pressure, cUL Listed 4L10, GREENGUARD Gold CertifiedCommercial/Residential: CommercialDepartment: Door HardwareProduct Category: Door Trim and AccessoriesProduct Dimension: W: 1/4″, H: 1-1/8″;Product Group: Door Trim and AccessoriesProduct Model: 303Product Subgroup: Astragals, Gaskets and WeatherstrippingProduct Substrate: AluminumProduct Type: GasketsSubcategory: Gaskets & WeatherstrippingWarranty: 5 YearProfessional ApplicationsFire-Rated Commercial Door SystemsHealthcare Facility Fire BarriersEducational Institution Safety ComplianceIndustrial Fire Separation RequirementsMulti-Tenant Residential Fire DoorsGovernment and Municipal Building SafetyHigh-Rise Building Fire Protection SystemsWhy Choose Pemko Quality?Pemko perimeter gasketing delivers professional-grade fire protection with comprehensive UL10C Positive Pressure fire rating and multi-hour performance capabilities for demanding commercial applications. GREENGUARD Gold certification and 5 Year warranty demonstrate the company’s commitment to environmental responsibility and long-term reliability. Engineered for critical fire and life-safety applications where dependable sealing performance is essential for code compliance and occupant protection.