ductwork in slab

zepfan

does anyone know the current standards for installing ducts in a concrete slab? we have a job that we are installing transit duct (duct with a coating that makes it suitable to be installed in the ground) i looked in the imc,and all it says that ducts should be suitable to be installed underground,and in acca manual d there is nothing that mentions anything about installing ducts in a slab.thanks to all