The 51F 6X8X6 Ceiling Box with 4'' Extension from Southwark Metal Mfg Co is an essential component for effective air distribution in ceiling-mounted HVAC systems. This ceiling box measures 6x8x6 inches, featuring a 4-inch extension for versatile installation options. Constructed from durable materials, it ensures long-lasting performance and reliability. This product meets industry standards, making it suitable for various applications in residential and commercial environments. Optimize your ceiling air distribution with this high-quality ceiling box.