The 28R 4X14X7 End Boot with 4-inch Extension from Southwark Metal Mfg Co is engineered for superior airflow in HVAC systems. Featuring a 4-inch inlet and a 14-inch by 7-inch outlet, this boot is constructed from high-quality materials for long-lasting performance. The 4-inch extension allows for flexible installation, making it ideal for various duct configurations. This product is perfect for both residential and commercial applications, ensuring a secure fit and efficient air distribution. It meets industry standards for quality, making it a reliable choice for HVAC professionals.