NFRC procedural documents now available

Greenbelt, Md.-based National Fenestration Rating Council recently published two documents pertaining to procedures for determining the energy performance of attachment products, according to a Feb. 28 release. The NFRC 100 A - 2010, whichexplains the procedure for determining fenestration attachment product U-factors, is available here. The NFRC 200 A - 2010,whichdescribes the procedure for determining fenestration attachment product solar heat gain coefficient and visible transmittance at normal incidence, is available here.