Generac Power Systems Commercial line of standby generators feature exclusive Whisper-Test® for ultra-quiet operation during the units weekly self-testing period. When normal utility power is present, Quiet-Test allows the generator to run at reduced speeds, thereby lowering sound pressure by as much as 12dB. This is especially important in areas where residences or other businesses are close by. Clean, natural gas fueled. No diesel fuel storage or exhaust emissions to worry about. Great for larger homes and businesses. HTS transfer switches sold separately. U.S.A.Engine Generac L-4 2.4L Engine Speed (RPM) 3,600 Rated Watts NG (kW) 60 Volts 120/280 Engine Cooling Liquid Start Type Automatic Phase 3 Noise Level (dB) 73 Transfer Switch No Fuel Type Natural Gas Enclosure Yes/ Steel Battery Required Yes Battery Included No Auto Shutdown Yes UL Listed Yes Dimensions L x W x H (in.) 88 19/32 x 33 1/2 x 47 25/32 * Ultra-Quiet Mode with Whisper-Test® feature for near-silent operation during self-testing * Auto Shutdown: Yes (Low oil pressure, high temperature, over speed and/or overcrank) * Meets 2009 EPA standards * All generator sales are final Standby generators require installation involving permanent outdoor placement, electrical wiring and fuel source connections. We recommend the use of a trained professional for final connections of gas and electric.