HVACR NewsMagazine December 2017

Code, Regulation, & Legislation

liner without an offset, the area is reduced to 116.375 and the friction rate goes up to about .28 with an ECM fan or the flow drops to 760 with a PLC fan. Bring the internal insulation up to 1½“ to get the R6, the area drops to 95.6 sq.in. and the friction increases to .4 with a ECM fan or the flow drops to 600 with a PLC fan. The question is, does the installer design the plenum so the full space provided by the manufacturer is also the net installed ID. CFM and friction are huge in delivering the correct air flow. Many installers create a much dimensionally larger box; however, it is difficult to seal the bottom of the box and frequently there is no seal. Of course, this is a huge air leak— one that will be turned down by an inspector.

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Energy Code

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