EMTs are subdivided into several classes including EMT-B (Basic), EMT-I (Intermediate), and AEMT (Advanced). The intermediate class of EMT is further subdivided into the 1985 and 1999 grouping. As a rule, minimum psychomotor skills and typical procedures in respect to airway management include all those provided by an EMR as well as insertion of airway adjuncts into the nasopharynx and use of additional positive pressure ventilation devices.