A blower should pull about 18 amps of power. You will be pulling about 36 amps and probably closer to 40 amps with two blowers going. If there are separate 20 amp circuits on the generator it could do it. 40 amps x 120 volts = 4800 watts. I am betting it will tax the generator a little because you will be over 50% load and you may blow circuit breakers when turning the second blower on. That is my quick and dirty estimate. Maybe the electricians have a better answer.