All other things equal, what is the difference mechanically between CARB and EPA 3 rated power equipment? Harbor Freight makes 2 different 9000 watt generators. Same output, same price. One is listed as "CARB", (which I'm assuming stands for clean air something or other). The other is listed as EPA 3.
https://www.harborfreight.com/engin...gas-powered-generator-epa-iii-63970.html
https://www.harborfreight.com/engin...fe-gas-powered-generator-carb-63968.html
https://www.harborfreight.com/engin...gas-powered-generator-epa-iii-63970.html
https://www.harborfreight.com/engin...fe-gas-powered-generator-carb-63968.html