PLANET LI-PL-050 Drop-Down Threshold Seal US-FH+RD Fire & Smoke Rated 20mm 47dB 585mm

Product Overview

The Planet US-FH+RD drop-down threshold seal is designed for use with single or double-leaf fire-rated and smoke-control doors made from wood, PVC, or steel, as well as sliding doors. Its robust aluminium profile (8x30 mm) houses a high-quality silicone gasket, providing up to 47 dB acoustic insulation for demanding commercial and institutional environments. Installation is performed without removing the door leaf, reducing downtime during retrofit or new construction projects.

A key differentiator of the US-FH+RD is its maximum gasket drop of 20 mm with adjustable extension via the included tool, which allows reliable sealing even with uneven or worn floor lines. This adjustability minimizes the risk of air, smoke, or sound leakage in variable site conditions, meeting the requirements for smoke-control and fire-rated assemblies. It is particularly recommended for fire protection contractors, acoustic engineers, or OEMs requiring a certified solution for diverse door materials and installations.

Key Features

• 20 mm adjustable seal drop ? ensures reliable contact with uneven or sloped floors


• Acoustic insulation 47 dB ? provides substantial noise reduction for commercial or multi-family applications


• No door removal required ? fits to doors in-situ, reducing installation labour and downtime


• High-quality silicone gasket ? offers durability and sealing efficiency over repeated cycles


• Compatible with wood, PVC, steel, and sliding doors ? broad application range for different door constructions


• Profile dimensions 8x30 mm ? discreet fit for minimal visual impact


• Stainless steel mounting components ? corrosion-resistant hardware for long service life

Technical Specifications

• Seal Drop (Extension): up to 20 mm


• Profile Dimensions: 8x30 mm


• Acoustic Insulation: 47 dB


• Material (Seal): Silicone


• Mounting Hardware Material: Stainless steel


• Compatibility: Wood, PVC, steel, and sliding doors


• Maximum Shortening: 125 mm


• Made in: Switzerland


• Length: 585 mm

Applications

Suitable for fire-rated and smoke-control doors in office buildings, schools, hotels, hospitals, residential complexes, and other commercial or institutional environments. Compatible with both hinged and sliding doors, including doors constructed of wood, PVC, or steel. Recommended for use in projects requiring acoustic insulation, smoke control, or retrofit upgrades to meet performance standards.

Packaging & Shipping

Standard export packaging. Each unit includes the threshold seal, stainless steel mounting hardware, installation screws, adjustment tool, and mounting plate, with instructions provided for installer guidance.