Description

20″ x 6″ Transition Box

20″ x 6″ Transition Box delivers both performance and practicality. Specifically engineered for marine, RV, and compact living environments, this low-profile transition box is designed to distribute chilled air efficiently while fitting into tight or shallow spaces.

The 20″ x 6″ size offers an excellent balance between airflow capacity and spatial flexibility. It’s especially suited for areas like under-seat compartments, bulkheads, overhead cabinets, or narrow wall cavities where traditional square boxes may not fit. Despite its slim profile, the unit is built to maintain strong and consistent airflow, supporting optimal climate control in your chosen area.

This transition box is fully compatible with MSI grilles and ducting systems, ensuring a seamless connection from the air handler to your grille—whether you’re using wood-framed or plastic-framed grilles. The shape helps minimize turbulence and backpressure, promoting a smooth and quiet distribution of cooled air into living spaces.

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 at the air handler to the transitions behind the grilles. The 20″ x 6″ Transition Box is a key part of this system, helping you complete your installation with confidence and efficiency.

Manufactured from lightweight, durable materials, this box is made to withstand the conditions of marine and mobile use—including vibration, temperature swings, and moisture exposure. Whether you’re working on a new installation or retrofitting an existing HVAC system, this box simplifies the process while ensuring performance that lasts.

This item ships direct from the manufacturer, guaranteeing quality assurance and timely delivery to your door.

Key Features:

• Designed for MSI ducting and grille systems

• Slim 20″ x 6″ profile – ideal for tight or shallow spaces

• Compatible with wood or plastic-framed grilles

• Promotes efficient, low-resistance airflow

• Durable and lightweight for marine/RV environments

• Ships direct from the manufacturer

Choose the 20″ x 6″ Transition Box for powerful airflow in places where space is limited but performance can’t be compromised.