motor car washing machine
The spacing between main tees (the primary runners that run the length of the ceiling) is commonly 4 feet apart when installed in a rectangular grid configuration. The cross tees, which connect the main tees and create the grid layout, are generally found in lengths of 2 feet and 4 feet, allowing for flexibility in design and installation.
t bar ceiling grid dimensions

Fire ratings for access panels are critical in maintaining the overall fire safety of a building. In the event of a fire, structural components such as walls and ceilings are designed to prevent the spread of flames and smoke. If an access panel is not properly rated, it can create a weakness in these fire-resistive barriers, allowing flames to travel through concealed spaces, which can lead to a faster spread of fire and smoke.
rated ceiling access panels
