Size Details: The 7-inch to 4-inch duct reducer measures approximately 5.9 inches (150 mm) in length and 0.02 inch (0.6 mm) in thickness, ideal for connecting 7-inch and 4-inch duct systems to ensure smooth airflow. Please verify the specifications and dimensions before purchase. Tapered Design: This 7-inch to 4-inch duct reducer features a precision tapered design to minimize airflow turbulence and reduce pressure loss, making it suitable for HVAC, exhaust, and industrial applications. Sturdy and Long-Lasting: Made from galvanized steel, this duct reducer is durable, corrosion-resistant, and built to withstand demanding environments—ideal for industrial, commercial, or outdoor use. Functional and Effective: Raised edges on both openings provide enhanced grip when connecting ducts. The crimped design on the smaller end allows for easy insertion into the ducting, ensuring secure and stable connections. Easy Installation: Simply insert a straight or flexible pipe and secure it with a steel clamp or foil tape to create an airtight seal. This round duct connector helps reduce air leakage and improve system efficiency. Color: Silver Material: Metal Package Contents: 1 × 7-inch to 4-inch duct reducer Note: Color may vary slightly due to lighting and screen settings. Measurement tolerance is ±1–3 cm.