Description

14″ x 4″ Transition Box 

14″ x 4″ Transition Box offers the ideal balance of slim design and high performance. Engineered for marine, RV, and other compact HVAC systems, this low-profile transition box is the perfect solution for channeling cooled air into tight, narrow areas without compromising on airflow or efficiency.

With its 14″ x 4″ dimensions, this box is especially well-suited for shallow spaces such as under seating, behind panels, inside slim wall cavities, or overhead compartments. Its linear shape ensures a smooth, even distribution of air while minimizing resistance and noise, making it a reliable choice for living quarters, sleeping areas, and compact control zones.

The 14″ x 4″ Transition Box is designed to integrate seamlessly with MSI grilles and ducting systems. Whether you’re using wood-framed or plastic-framed grilles, this box offers a precise, secure connection point between your flexible ducting and the air outlet. It helps maintain proper airflow pressure, minimizes energy loss, and ensures consistent cooling performance throughout your system.

Whatever your choice, wood-framed or plastic-framed grilles, you will require a way to effectively duct the chilled air to them. We offer a wide selection of plastic ducting products—from the hose adapter on the air handler to the transitions behind the grilles. The 14″ x 4″ Transition Box plays an essential role in that chain, serving as the bridge between cooling equipment and comfort.

Made from lightweight, corrosion-resistant materials, this transition box is built to withstand the unique challenges of marine and mobile environments—such as vibration, humidity, and temperature changes. Its sturdy construction allows for easy installation and long-term durability in demanding conditions.

This item ships direct from the manufacturer, ensuring consistent quality, expert craftsmanship, and timely delivery.

Key Features:

• Slim 14″ x 4″ profile for narrow installation spaces

• Designed for use with MSI ducting and grille systems

• Compatible with wood or plastic-framed grilles

• Promotes quiet, even airflow in tight spaces

• Lightweight, corrosion-resistant construction

• Ships direct from the manufacturer

The 14″ x 4″ Transition Box is the smart solution for low-clearance HVAC installations that require reliable performance and professional-grade integration.