Relier Pairs Air Distribution Systems - section 3Version en ligne NCCER Air Distribution Systems - section 3 trade terms par Valerie Jimenez 1 Radial system 2 Reducing-Trunk duct system 3 Perimeter-loop system 4 Extended-Plenum duct system 5 R-value 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. Used in structures built on concrete slabs, it has a continuous duct embedded in the slab. 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.
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