Access panels feature easy-grip handles. Innovative, easy starting, no-strip screw feature on unit access panels, and tool-less filter access door. New terminal board facilitating simple safety-circuit troubleshooting and simplified control box arrangement. All units are field-convertible to horizontal airflow, which makes it easy to adjust to unexpected job site complications. Lighter units make easy replacement. Most 3- to 12.5-ton 581J rooftops fit on existing Bryant curbs dating back to 1989. Also, the large control box gives the technician room to work and mount accessory controls.