floor tile (perforated)

Perforated floor tiles have holes allowing airflow from the sub-floor plenum into the cleanroom, enabling air return in vertical flow designs. **Design**: Metal or polymer panels with circular or slot perforations. Perforation pattern determines airflow rate. **Open area**: Typically 15-25% open area. Higher percentage = more airflow. Adjustable dampers below for balancing. **Airflow pattern**: Filtered laminar air from ceiling FFUs flows down through room, exits through perforated floor tiles into sub-floor plenum. **Material**: Aluminum or steel with conductive coating for ESD control. Must withstand cleanroom chemicals. **Load rating**: Same structural requirements as solid tiles - support equipment, personnel. Usually rated for point and rolling loads. **Balancing**: Damper plates below tiles adjusted to achieve uniform airflow across the room. Prevents dead zones. **Cleaning**: Perforation holes must be kept clear. Periodic inspection and cleaning. **Edge sealing**: Tiles sealed to frames to prevent unfiltered air bypass. **Alternatives**: Grated flooring in very high airflow areas, solid floors with wall returns.