There are many parts and pieces in a grid system. See the image below for the anatomy of a drop ceiling grid system.

A. Main Beams carry the load of the grid system, typically 12’ or 6’.
B. Cross Tees are the supporting grid pieces that attach perpendicular to the main beams, helping  create the 24” x 24” or 24” x 48” openings needed for your tiles.
C. Wall Moldings are used as finishing trim to hang against the walls in the space.
D. Ceiling Tiles are the tiles used to make up the drop ceiling.
E. Hanger Wires attach to the ceiling joists and are how the main beams and cross tees hang.
F. Plenum is the area or space in between the drop ceiling and the structure above, typically floor  joists or an old ceiling.

ML and XL® describe how main beams and cross tees attach to one another. The ML is a hook grid system and the XL® is a stab grid system. The XL® is required for seismic and specialty ceiling applications but is also the most common connection type across the United States.

The type of grid system needed is dependent on a few different things. First thing to consider is what size and type of tiles will be used within the space. Another thing to consider is the look you want. We have grid systems available in many styles and sizes. Additionally, you have unique circumstances to consider. We have grid systems for use in seismic areas, fire rated grids, as well as grids used for Clean Room™ spaces. As always, reach out to one of our customer support experts or our installation services team for guidance on your specific circumstance.

Yes, our ceiling grids can be cleaned. Our grid components are made from hot-dipped galvanized steel, with a corrosion-resistant zinc finish protecting it from rust. Refer to our cleaning guide and disinfecting guide for more info.

Fire Guard™ means that the product is engineered and tested as part of a fire resistant system, which includes tile, grid and the structure itself. Please check local building codes requirements for your space. The following link will direct you to additional information and support for Armstrong's Fire Resistant ceiling systems.

Fire ratings refer to flame spread and smoke development. Ratings indicate how rapidly flame spreads on one surface as compared to another. The flame spread rating is broken into three categories: Class A, Class B and Class C. Class A products have a flame-spread of 25 or less, and smoke developed of 50 or less. Class C products have a flame-spread of 76-200, and smoke developed of 0-450. Class A products are appropriate in the majority of commercial applications and Class C products are appropriate in most residential applications.