Check the listing for details. 36" Linear Slot Diffuser - (2 Slot) Double Slot - White Decorative Air Vent - Mo. Condition: New. Listed at 79.99 USD. Commercial Grade Solid Aluminum with Modern Architectural DesignThis Model can be used in Ceilings, Walls, and FloorsThis Model can be used as a Supply Vent Cover and Return Vent CoverCFM 302 ft3/min - Effective Velocity 9.8 ft/sNeck: 35 3/8" x 3 1/8" - Face: 36 3/4" x 4 1/2"2 Slot - 3/4" Slot Width180° pattern adjustment and complete flow rate controlTexas Buildmart offers High Quality Linear Slot Diffusers. This model shoots a 180-degree spread with option to adjust to one side or the other. They have decorative directional dampers. Modern, crisp, clean lines and architecturally appealing. Solid extruded aluminum profile with welding - Electrostatic Paint. This product can be used as a supply and as a return register vent cover for ceilings, walls, and floors but looks like a Modern Contemporary looking fixture. If this model is used as a Return, please make sure this vent cover is placed in full open position or remove the directional dampers. Here's a link to the Plenum Box that fits this Diffuser:36" X 3.5 PLENUM BOX 2 SLOTS How to install Standard Linear Slot Diffuser: https://youtu.be/2vmJdVYm500