Rheia™ Dual Duct Floor Boot Assembly — 4" x 10" Register, 2 x 3" Ducts | Part #10-01-310

Double the Airflow Into a Standard Floor Register

Big rooms and high thermal loads need more air than a single duct can comfortably deliver, but nobody wants two registers cut into a beautiful hardwood floor. The Rheia™ Dual Duct Floor Boot brings two 3" Rheia™ flexible ducts into one standard 4" x 10" opening, doubling the capacity while the finished floor looks exactly the same as every other room in the house.

It mounts recessed into the subfloor and accepts off-the-shelf 4" x 10" register grilles, so your finish selections stay wide open. Molded from a flame-retardant PC/ABS engineering thermoplastic rated UL94 V-0, it is UL 181C listed and UL 2043 rated for air-handling spaces, and it is 100% recyclable.

Key Features

Dual 3" Duct Capacity — Feeds two 3" Rheia™ ducts into a single terminal for rooms with higher thermal loads or larger square footage.

Standard 4" x 10" Register Opening — Keeps conventional register sizing and cutouts despite the added capacity.

Subfloor Recessed Mounting — Sits down into the floor assembly for a flush register landing.

Flame-Retardant Engineered Polymer — PC/ABS blend rated UL94 V-0 for use within floor and framing cavities.

Plenum-Space Rated — UL 2043 tested for heat and visible smoke release in air-handling spaces.

Technical Specifications

Part Number: 10-01-310

Register Opening Size: 4" x 10"

Duct Connections: Dual 3" diameter ports (2 x 3" ducts)

Mounting Type: Subfloor / floor recessed

Material: Flame-retardant PC/ABS blend

Color: Black / neutral housing

Flame Rating: UL94 V-0

Certifications: UL 181C Non-Metal Joining Accessories for Flexible Air Ducts (File MH64419), UL 2043

Recyclability: 100% recyclable

Warranty: 2-year limited warranty

What's in the Box

(1) Rheia™ Dual Duct Floor Boot Assembly, 4" x 10"