Isebe le-LEAWOD e-USA lifumene isiqinisekiso se-NFRC samazwe ngamazwe somnyango neefestile, i-LEAWOD yaphucula ngokusesikweni uphawu lwamazwe ngamazwe lomnyango neefestile.
Ngenxa yokwanda kokunqongophala kwamandla, ukuphuculwa kweemfuno zokonga amandla kwiingcango nakwiifestile, iNational Fenestration Rating Council (NFRC) kunye ne-Energy Star Program yeSebe lezaMandla lase-US kunye ne-EPA beziqinisekisa ukusebenza kobushushu kweengcango neefestile ukusukela ngo-1989. I-NFRC, umbutho ongenzi nzuzo owamkela ilebhile entsha yokusebenza kokusetyenziswa kwamandla ngo-2005, uhlala ufuna isiqinisekiso sokusebenza kakuhle kobushushu se-NFRC kwiimveliso zeengcango neefestile zase-US. Ukongeza, isiqinisekiso se-NFRC linyathelo eliyimfuneko kwisiqinisekiso se-Energy Star. Kwinqanaba elitsha, i-LEAWOD iya kukhuphisana neengcango kunye neenkampani zeWindows ezibalaseleyo kwihlabathi, ezenzelwe eTshayina.