Quest Return and Intake Duct Kit - Quest 506, 506 277V, 746 430V, 876, and 706 50hz

Return and Intake Duct Kit for Quest 506, 746, 876, 706 Units

This kit is a different combination than Quest's standard supply-and-return kits: it ducts both the return air path and a separate fresh-air intake, rather than pairing supply and return together. That combination matters on the large commercial units it fits, where bringing in a controlled fresh-air intake alongside the return path is part of the ventilation design.

It's sized for the Quest 506, 506 277V, 746 430V, 876, and 706 50hz models and includes the return flange, intake collar, and hardware needed to complete both connections.

Key Features & Benefits

• Return flange — sized to mate directly with the compatible unit's return air inlet.
• Intake collar — provides a separate, dedicated connection point for ducting a fresh-air intake alongside the return path.
• Complete mounting hardware — fasteners and gasketing for both connections are included, reducing the parts list for a full installation.
• Distinct from a supply-and-return kit — this kit pairs return air ducting with a fresh-air intake, not with a supply-air discharge, which is a different airflow design intent for large-capacity units.
• Model-specific fit — flange and collar dimensions are matched to this specific group of large-capacity Quest models.

Who Should Use This

This kit is for facility installers setting up one of the compatible large-capacity Quest units with a ducted return air path plus a dedicated fresh-air intake, rather than a standard supply-and-return configuration.

About Quest

Quest is a Therma-Stor brand. It focuses on commercial dehumidification. Therma-Stor is headquartered in Madison, Wisconsin. It's the same parent company behind the Anden brand. Therma-Stor has built dehumidifiers and environmental-control equipment for decades. Quest specifically targets commercial and industrial moisture control. Think indoor cultivation, food production, and commercial buildings. That's a different focus than residential basement units. Many overhead models use the company's patented M-CoRR design. M-CoRR stands for multi-coil refrigeration. The design recycles heat pulled from the air. That happens during dehumidification itself. It improves energy efficiency as a result. It also cuts heat sent back into the room.

Frequently Asked Questions

How is this different from a Supply and Return Duct Kit?

A Supply and Return Duct Kit pairs a supply-air discharge flange with a return-air flange. This kit instead pairs a return-air flange with a fresh-air intake collar, which is a different ventilation design used specifically on the large-capacity models it's compatible with.

What's included in this kit?

The kit includes a return flange, an intake collar, and the mounting hardware needed to complete both connections. Ductwork itself and any additional fittings needed to reach the intake and return points are sourced separately.

Which Quest models is this kit compatible with?

This kit is compatible with the Quest 506, 506 277V, 746 430V, 876, and 706 50hz models. Confirm your exact model and voltage variant against the current compatibility list before ordering.

Why would a large dehumidifier need a dedicated fresh-air intake?

On large commercial units serving big cultivation spaces, bringing in a controlled volume of fresh outside air alongside the return path is part of a broader ventilation strategy, helping manage CO2 levels and overall air exchange rather than just humidity. This kit gives that fresh-air path a proper ducted connection instead of an unsealed opening.