NITC Refresher Course for ASSE 6005, 6010, 6020, 6030 & 6040 customers. This refresher covers the changes to the NFPA 2021 edition and is accepted by National ITC as fulfilling the 4 hour course requirement to take their upgrade tests. This course is entirely online and includes audio instruction along with a presentation covering the major changes in the 2021 edition of NFPA 99. Keep your medical gas license(s) current and upgrade today!