This 16" x 20" x 36" R6 insulated supply plenum box is designed to distribute conditioned air efficiently throughout your home. Constructed with durable galvanized steel and lined with R6 foil-faced insulation, it helps minimize energy loss, reduce system noise, and prevent condensation. Ideal for upflow HVAC systems, this plenum connects directly to your air handler or furnace, creating a sealed and insulated pathway for your ductwork.