    Issued guidelines to upgrade the Fireproofing to a    Sentence: 1: In 1999, NIST: foung » the: Port. Authority  thickness of 11/2 inches    Sentence’ 2: The NIST discovered that in, 1999 the Port  Authority. issued guidelines: to upgrade the fireproofing to  a thickness of 11 / 2 inches: 7    : .  TT