Rheia™ Floor Boot Assembly — 4" x 10" Register, 3" Duct | Part #10-01-280

Modern Ductwork, Ordinary Floor Register — No Compromise Either Way

Every flooring supplier, big-box store, and finish carpenter already knows the 4" x 10" floor register. The Rheia™ Floor Boot Assembly lets you keep that standard opening while running the compact 3" flexible ductwork of a modern home-run system underneath it, so the finished floor looks exactly like the homeowner expects and the register grille they picked out still drops right in.

It mounts recessed into the subfloor and connects to 3" Rheia™ duct, making retrofits and mixed-system homes far simpler to plan. 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

Standard 4" x 10" Register Fit — Integrates the Rheia™ system into common floor opening cutouts and off-the-shelf register grilles.

3" Duct Connection — Connects directly to Rheia™ 3" flexible ductwork.

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: 10-01-280

Register Opening Size: 4" x 10"

Duct Connection Size: 3" diameter port

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™ Floor Boot Assembly, 4" x 10"