PHI demonstrated its commitment to encouraging the North American manufacture of Passive House windows by holding the first ever North American Window Certification Workshop immediately following the Greenbuild Convention on November 16 in San Francisco. Dr. Benjamin Krick of PHI led the workshop, introducing the current protocols involved in window certification as well as unveiling PHI’s new simulator accreditation scheme. Attendees included representatives of the National Fenestration Rating Council (NFRC), DOE, Lawrence Berkeley National Labs (LBNL) as well as leading window manufacturers from across the US.