If you do not have this size flex, you can use a reducer to modify the size.This air-distribution box attaches directly to the supply of the HVAC equipment that heats or cools the air.Entry size: 2 entries of 10' flex in oval shape.Galvanized sheet metal Plenum Box with foam insulation.Ideal for Texas Buildmart 48' Lineal Slot Diffuser - 3 Slot.Professional HVAC Installer is Recommended.
Can be used and brazed to a 4' or 6' wood stud. Connects to: 10' flexible duct in oval shape. This air-distribution box attaches directly to the supply of the HVAC equipment that heats or cools the air. Galvanized sheet metal Plenum Box with black foam insulation, ideal for Texas Buildmart 48' lineal slot diffuser.