BUILDMART - 28x6 MUD-IN Air Vent Cover - Drywall Mud-in White Air Vent - Mud Linear Slot Diffuser - Register Grille for Ceiling and Walls - Texas BuildmartOur Standard Linear Slot Diffusers have ASHRAE 70 and ANSI S12. 51 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 and Walls This Model can be used as a Supply Vent Cover and Return Vent Cover CFM: 312 ft3 min Effective Velocity: 9. 8 ft s Neck: 27 5 8" x 5 15 16" Face: 29 5 8" x 7 7 8" This is a Non Filter

Mouth Dimensions: L: 59 1/4" W: 5"

Neck: 23 5/8" x 3 15/16" - Face: 25 1/2" x 5 7/8"

CFM: 770 ft3/min - Effective Velocity: 9

CFM: 492 ft3/min - Effective Velocity: 9

CFM: 763 ft3/min - Effective Velocity: 9

*This is a Design and Utility Patent Pending Product*

Neck: 5 7/8" x 5 15/16" - Face: 7 7/8" x 7 3/4"This is a Non-Filter Model

CFM: 360 ft3/min - Effective Velocity: 9

ASIN: B09GJCN2FH

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

ASIN: B09K5YJ9MS

6 x 4 6x4 4x6 4 x 6