Satisfaction Guaranteed Buildmart - 12" Linear Slot Diffuser - 3 Slot - Triple Slot - Black Decorative Air Vent - Modern Ac Vent Cover For Ceiling, Walls & Floors - Texas Buildmart Save Big: 55% Off [5UlXuDom]

• Our Linear Slot Diffusers have ASHRAE 70 and ANSI S12.5 Engineering Certifications
• Designed and Engineered to the Highest HVAC Industry Standards
• Commercial Grade Solid Aluminum with Modern Architectural Design
• This Model can be used in Ceilings, Walls, and Floors
• This Model can be used as a Supply Vent Cover and Return Vent Cover
• CFM: 196 ft3/min - Effective Velocity 9.8 ft/s
• Neck: 11 13/16" x 4 11/16" - Face: 13 1/4" x 6 1/8"
• 3 Slot - Triple Slot - 3/4" Slot Width
• 180° pattern adjustment and complete flow rate control

•   Texas Buildmart offers High Quality Linear Slot Diffusers. This model shoots a 180-degree spread with the 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 black linear air vent register can be used as a supply air vent cover for ceilings, walls, and floors. This vent cover was designed to be decorative and not structural. You can use this as a floor vent cover, but it is not designed to support weight, adding any type of weight is not recommended. This vent can be used as a return air vent cover as well. This register is not only a vent cover, but it looks like a Modern Contemporary looking fixture. If our Modern AC Vent Cover is used as a Return air vent cover, please make sure the air vent cover is placed in the full open position or remove the directional dampers 
  

Here's a link to the Plenum Box that fits this Diffuser:

12'' X 4 3/4" Linear Slot Plenum Box - For Triple Slot (3 Slot) Linear Diffuser - Texas Buildmart - Modern AC Vent Covers for Ceilings, Walls & Floors - Commercial Grade HVAC Registers, Grilles & Vents - Home Decor & Wall Decor for Amazon Home