Controls voltage regulation to +/-1 percent no load to full load. Sound level is an impressive lower than 68dB full load at 23 feet. Weatherproof generator housing is built from a 13 gauge steel with a seven stage powder coated finish for maximum durability. This fully lockable enclosure comes standard with baffles and insulation to reduce operating noise. Easy Maintenance Design - Quick, direct access to all filters. External fluid drain extensions allow fast, easy service. Reverse flow air cooling exhausts from the top of the unit ensuring a dust free work area. Voltage Selector Switch - Voltage change made simple, No need for a reconnect board. Protected by a lockable panel. Comply with NEMA Standard.