BUILDMART - 18x18 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: 492 ft3 min Effective Velocity: 9. 8 ft s Neck: 17 3 4" x 17 9 16" Face: 19 3 4" x 19 5 8" This is a Non Filter

ASIN: B06XQ5R5SZ

CFM 193 ft3/min - Effective Velocity 9

Neck: 9 5/8" x 7 5/8" - Face: 11 3/4" x 9 13/16"

Neck: 70 13/16" x 4 3/4" - Face: 72 5/16" x 6 1/8"

ASIN: B081QWLB5M

Entry size: 9" flex in oval shape

Mouth Dimensions: L: 47 9/16" W: 1 3/4"

Neck: 11 5/8" x 7 5/8" - Face: 13 3/4" x 9 13/16"

but it is not designed to support weight

Total Box Dimensions: L: 72 3/8" W: 3 1/8" H: 12"

ASIN: B09J9ZM4NC

Texas Buildmart offers Mud In Air Vent Covers also known as Drywall Mud-in White Air Vents