Io Hvac Controls RAT-04 Retrofit Air Terminal 4 in

Product Description

The IO HVAC CONTROLS RAT-04 is a 4-inch retrofit air terminal designed for use in HVAC zoning and airflow control applications. Air terminals of this type regulate conditioned air delivery at the branch duct level, making them a core component in residential and light commercial zoning systems. Licensed HVAC technicians install this unit when retrofitting existing duct systems with zone control capability. The RAT-04 is sized at 4 inches to match standard round duct connections common in residential construction.

This air terminal is suited for retrofit installations where adding zone control to an existing forced-air system is required. It fits into 4-inch round duct branches and is typically installed as part of a multi-zone HVAC control system. The retrofit design minimizes the need for major ductwork modification, making it practical for service and upgrade work on existing residential systems.

Key Features

• 4-inch duct connection size for compatibility with standard residential branch ducts
• Retrofit-oriented design reduces ductwork modification during installation
• Suitable for use in residential and light commercial HVAC zoning systems
• Compact form factor supports installation in tight duct runs and confined spaces

Compatibility

Designed as an OEM-style retrofit replacement air terminal for 4-inch round duct branch connections in residential forced-air HVAC zoning systems.

Installation Notes

Installation should be performed by a licensed HVAC technician familiar with zoning system wiring and duct balancing. Power down the air handler and any associated zone control board before beginning installation. Ensure the duct branch is clean and free of obstructions before seating the terminal. Follow local mechanical codes and manufacturer zone controller wiring guidelines during commissioning.

Technical Specifications

• Duct Size: 4 inches

Standard Information

• Brand: IO HVAC CONTROLS
• Manufacturer Part Number: RAT-04