Briggs & Stratton 40301 7,000 Watt EmPower Natural Gas/Liquid Propane Powered Air Cooled Home Standby Generator Generators have an automotive-style exhaust system and acoustic foam dampeners to ensure 50-percent quieter operation than most portable generators Air-cooled standby generators have an automotive-style exhaust system and acoustic foam dampeners to ensure 50-percent quieter operation 504cc intake engine with a permanent connection to natural gas or propane gives performance requiring no messy gasoline storage and refueling Contemporary, space-saving design features steel enclosure features automotive paint for maximum durability and all-weather protection; CARB compliant Measures 31.5-inches in length by 30.25-inches in width by 34-inches in height; 4 year warranty; remote system status