BUILDMART - 24" Plenum Box for [24" Linear Slot Diffuser - 1 Slot - Single Slot] Premium Insulated Plenum Box for Heating and CoolingGalvanized sheet metal Plenum Box with foam insulation, ideal for Texas Buildmart 24" lineal slot diffuser. This air distribution box attaches directly to the supply of the HVAC equipment that heats or cools the air. Connects to: 8" flexible duct in oval shape. Can be used and brazed to a 4" or 6" wood stud. If you do not have this size flex, you can use a reducer to modify the size. Professional HVAC Installer is Recommended. Ideal for Texas

CFM: 770 ft3/min - Effective Velocity: 9

Neck: 11 13/16" x 9 9/16" - Face: 13 15/16" x 11 11/16"

Neck: 11 7/8" x 3 7/8" - Face: 13 15/16" x 5 15/16"

CFM: 248 ft3/min - Effective Velocity: 9

Total Box Dimensions: L: 60 1/2" W: 3" H: 12"

CFM: 420 ft3/min - Effective Velocity: 9

Neck: 21 9/16" x 7 13/16"- Face: 23 11/16" x 9 13/16"

CFM: 216 ft3/min - Effective Velocity: 9

with reinforcement brackets on the back and a uniform coat of electrostatic paint for a sleek

18 x 8 18x8 8x18 8 x 18

Neck: 27 5/8" x 3 15/16" - Face: 29 1/2" x 5 15/16"

ASIN: B09WTH4C2P