Maintenance: filters, batteries, the 6, 12 and 24-month schedule, 15,000 hours, cleaning and records

Plan and carry out HT70 maintenance to the manufacturer's schedule: user-level filter care, the periodic Quick Checks, the 24-month replacement set with calibration and OVP, the 15,000-hour service, battery care, safe cleaning and a record that shows the history of each unit.