The 51F 6X10X6 Ceiling Box with 4'' Extension from Southwark Metal Mfg Co is a high-quality component designed for effective airflow in ceiling installations. Measuring 6 inches by 10 inches with a height of 6 inches, this ceiling box is made from durable materials that comply with industry standards. The 4-inch extension allows for flexible installation options, making it suitable for various ceiling configurations. This product is ideal for both residential and commercial applications, ensuring efficient airflow and enhancing HVAC system performance.