Welcome to the National Inspection Testing and Certification Corporation (NITC)—a trusted leader in certification for the Medical Gas, Plumbing, Pipefitting, HVACR, and Fire Protection & Safety industries. At NITC, certification is more than a credential—it’s a commitment to safety, quality, and industry excellence. NITC holds ANAB accreditation for key programs, including: Medical Gas Installer Medical Gas Instructor Medical Gas Verifier STAR HVACR Mastery All NITC exams—whether accredi