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5, the strong reflective ability of mineral fiber, can effectively improve indoor light, protect vision and eliminate fatigue.

Historical Context

1. Standard Access Hatches These hatches are typically square or rectangular and are designed to fit within standard ceiling grids. They are often made from materials like metal or plastic and can have hinged or removable panels.

The primary purpose of fire-rated access panels is to ensure that building codes and safety regulations are met in commercial and residential structures. They play a vital role in maintaining the integrity of fire-rated ceilings, which are specifically designed to slow down the spread of fire and provide occupants with additional escape time during emergencies.