Pasimy 4-inch Dia x 3-1/4 x 10-inch L Rectangular to Round Galvanized Steel Duct Transition

Overview

The Pasimy rectangular to round duct transition is a galvanized steel connector designed to bridge rectangular ducting and round ducting in a single, reliable piece. With an approximate length of 10 inches and a 4 inch round opening, this transition helps you join a 3-1/4 x 10 inch rectangular duct to a 4 inch round duct with ease. The galvanized finish offers a clean, modern look and a level of rust resistance suitable for both indoor and outdoor settings. This listing includes one piece, ready for installation into your ventilation workflow.

Key benefits at a glance

• Durable galvanized construction resists rust and corrosion, helping your system stand up to weather and moisture.
• Indoor or outdoor compatibility supports a range of install locations, from basements to exterior walls.
• Smooth interior and a modest arc reduce air resistance, contributing to more efficient air discharge.
• Compact 10 inch length and a 4 inch round opening balance space savings with solid connection feasibility.
• Leak-free potential when installed with appropriate sealant and fasteners, helping maintain consistent airflow.

Real-world use cases

• Connects a rectangular duct to a 4 inch round duct for exhaust fans, enabling a clean passage from a wall vent to a ceiling run.
• Pairs well with vent seals, dryer vents, and exhaust components where a tight, rigid transition is needed.
• Ideal for retrofit projects where existing rectangular ducting needs a reliable round connection without bulky adapters.

How to install

• Preparation: wipe down the galvanized surfaces to remove dust and residue.
• Attachment: align the round end with the corresponding duct, then secure with clamps or screws as your setup requires.
• Sealing: apply aluminum foil tape along the seam to help minimize air leakage.
• Final checks: ensure the connection is firm and the arc guides air smoothly through the transition.

Included in the package

The listing includes one galvanized rectangular-to-round duct transition piece. Additional hardware may be required depending on your existing duct layout.

Safety and care

Note that the product may feature sharp edges. It is advisable to wear gloves during handling and installation to protect your hands. Regular checks for corrosion or wear will help maintain performance over time.