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Fire Resistance: REI 45 (Certified) Noise Reduction: 27 Decibels (Certified) Door Construction: Solid wood perimeter frame with mineral wool insulation and cladding Door Uprights: Double-sided with embossed interior and cross grain Frame Adaptability: 50 mm blockboard jamb with self-expanding hot smoke gasket, fits walls 11-13 cm Wire Coverage: Plywood with 25 mm fin for frame fitting Hinge Mechanism: Self-closing tropicalized steel, adjustable with double leg, 16 mm thick Gasket Insulation: Thermo-expanding sodium silicate-based for hot fumes and soundproofing on three sides Threshold Seal: Aluminum profile guillotine with rubber seal for perfect insulation Handle Material: Solid brass