The 28R 6X12X6 End Boot with 4'' Extension from Southwark Metal Mfg Co is engineered for optimal airflow in HVAC installations. With dimensions of 6 inches by 12 inches and a height of 6 inches, this boot is made from high-quality materials that ensure durability and compliance with industry standards. The 4-inch extension allows for flexible installation options, making it suitable for various duct configurations. This product is perfect for both residential and commercial applications, enhancing airflow efficiency and system performance.