Briggs & Stratton 40304 18,000 Watt IntelliGen Natural Gas/Liquid Propane Powered Air Cooled Home Standby Generator Fully Automatic Advanced electronics will detect a utility power outage and automatically start the generator whether you are home or away. Sound Shield Technology Engineered air passages, an automotive-style exhaust system and acoustic foam dampeners ensure quiet operation. CoastGuard All-Climate Enclosure Features heat/rust proof polymer vents and louvers, rounded corners and a 3-step automotive rust proofing & wet coat paint process for years of durable outdoor protection. Premium Warranty 4 year limited - your guarantee of quality and performance. CARB Compliant