Product Detail 3-piece top cover provides easy access and unsurpassed break resistance An internal cooling fan provides continuous airflow for the printhead-maximizing throughput productivity for long, unattended print jobs Additional feed rollers provide precise forms handling and printed-character placement accuracy Built to last, inside and out Rated at 20,000 hours MTBF . The "Okidata ML420 Impact Printer" is best product for you. We recommended Okidata ML420 Impact Printer