Relacionar Columnas Air Distribution Systems - section 3Versión en línea NCCER Air Distribution Systems - section 3 trade terms por Valerie Jimenez 1 R-value 2 Reducing-Trunk duct system 3 Radial system 4 Extended-Plenum duct system 5 Perimeter-loop system Uses round or rectangular trunks for the main supply and return, the ducts remain the same size and can be installed in a crawl space or attic. Each perimeter outlet is fed directly from the supply air plenum. The duct work can be installed in a concrete slab, crawl space or attic. Provides the best performance when properly sized, the pressure drop is maintained from one end to the other due to decrease in trunk size. Used in structures built on concrete slabs, it has a continuous duct embedded in the slab. A number that is used to indicate the ability of insulation to resist the flow of heat. The higher the R-value the better the insulating ability.
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