NFRC Test procedure for measureing the steady-state thermal transmittance of fenestration system, revised 1997
NFRC
1997 National Fenestration Rating Council, Silver Spring, MD
NFRC, (1997), "NFRC Test procedure for measureing the steady-state thermal transmittance of fenestration system, revised 1997", National Fenestration Rating Council, Silver Spring, MD.