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does anyone know what type of ductwork is suitable to be installed in the slab (underground) we have a job that we have given them a price on transient ductwork (plastic duct with a lining on the outside that is made to go in the ground) the customer balked at that price and the builder is saying that that type of duct is not needed and regular sheet metal duct is ok.i have told them that i do not feel comfortable installing anything but the plastic ductwork,because once it is in the slab,there is no turning back.i have also gone back on jobs with regular duct underground where it has filled up with water.i can't find anything in the international mechanical code that addresses this,and did not know if anyone knew of an ashrae standard for this.any assistance would be very helpful. thanks to all.
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