BUILDMART - 6x6 White Modern AC Vent Cover - Decorative Aluminum Air Vent - Standard Linear Slot Diffuser - Heating and Cooling Register Grille for Ceiling, Walls & FloorsThe Performance of This Buildmart Diffuser Was Verified Through Testing According to ASHRAE 70 and ANSI S12. 51 ISO 3741 Standard by AIRFLOW SCIENCES CORPORATION Submittals Available Upon Email Request 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

36 x 10 36x10 10x36 10 x 36

ideal for Texas Buildmart 12" lineal slot diffuser

CFM: 319 ft3/min - Effective Velocity: 9

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

Neck: 29 1/2" x 19 1/2" - Face: 31 1/2" x 21 1/2"

Neck: 9 7/8" x 5 15/16" - Face: 11 11/16" x 7 5/8"

Neck: 19 3/4" x 7 7/8" - Face: 21 5/8" x 9 13/16"

but it looks like a Modern Contemporary looking fixture

Ideal for Texas Buildmart 72" Lineal Slot Diffuser - 3 Slot

Total Box Dimensions: L: 25" W: 3" H: 11 7/8"

Total Box Dimensions: L: 25 1/16" W: 4 5/8" H: 11 7/8"

ASIN: B081ZMXZPZ