Well now i'm using a cross flow, but i'm looking into a side down draft or a semi-down draft which is not much different than a cross flow, but the inlet to the booth is on the top front of the booth and the exhaust is just in the back so it just pulls air from the top front.. so I'm not sure what to get,, i like the semi-down draft cause it will pull air from the top which is good for me cause heat rises and it'll pull in more warm air,, but the side downdraft would do the same I guess. but i'm not sure if i can use a side down-draft due to space issues...