Re:concession hood fan watts?
Figure about the same as your prep table,it would also have a surge on start up like your refrigeration,if it is belt driven even more,so you really need to take the surge ratings into thought in sizing the generator,or start one cooler let it get to temp then start the next one,otherwise you will be eating alot of generators and compressors.
But like it was posted ,without more info it is rough. 1/10 up to 1/2 is roughly 500 watts with up to 800 surge,1/2 is rare for 1000 cfm but no with no tag it is a guess to what the cfm is.
I have seen 800 cfm placed on 8 ft hoods before,not recommended though.