http://nseej.com/اخبار-اليوم/-135471/ Presently, producers who take part in the NFRC program must embrace certified U-values on the label. They elect whether to include the photo voltaic warmth gain coefficient, visible mild transmittance and emisivity on the label. Whereas seen transmittance, air leakage and emittance are bodily measured values. Sat, 17 May 2014 19:02:29 UTC en