Grid max 4′ tee 230-00, use with 15/16w grid, white – package of 25 gridmax is the low-cost alternative to replacing or repainting rusted, stained or deteriorated metal grid. Made from pvc vinyl – class a fire rated. Rust and corrosion resistant. The pre-notched main covers provide seamless transitions at cross-tee intersections for easy installation. Designed to cover 2 ft x 2 ft or 2 ft x 4 ft ceiling grid systems. features class a fire rated low-cost alternative to replacing rusted metal grid works with 15/16 or 1 width grid faces