Armstrong Ceilings Prelude Plus LD Natural Aluminum 20 Pack 144 in Aluminum Ceiling Grid Main Beam Air Tools and rubbed bronze finished knobs for and rubbed bronze finished knobs for a beautiful addition to your space ADJUSTABLE STORAGE: Includes an adjustable shelf for a functional and customizable storage solution DURABLE DESIGN: Constructed from durable engineered wood to provide long lasting use EASY INSTALLATION: Easy working load limit 12 ft LD Main Beam All aluminum for maximum moisture resistance Natural Aluminum in color Rotary stitched web for additional torsional strength and extra stability 240 linear ft per carton (20 pieces per carton) Suspension system 10 year limited warranty Typical applications include indoor swimming pools with proper ventilation and non magnetic areas MRI suites 144 in x 15 16 in x 1 1 2 in Series Name Prelude Plus XL Aluminum Type Main beam Height (Inches) 1