Built and installed new extended supply plenum for the package unit. Installed all new supply buckets with metal elbows attached. Added all new flex duct to every supply bucket. Upsized the return duct to 14 inch flex. Sealed all buckets to the floor with silicone/mastic. Sealed all duct connections with mastic. Strapped all ducts off the ground and added metal single wall pipe around flex to protect from animals where needed.