Ducts can be used to move gases, fumes, or just air for heating and cooling. The insulated design means they can help keep the temperature in a room consistent and save you money on energy bills. The ducts are easy to install and are very durable. They will take ordinary shipping and handling without damage, and they will withstand the backfilling process of earth or concrete without... https://www.duratarpaulin.com/product/pvc-air-ducting-material/