Duke, yea they are, found them at Lowes ...........
Chuch, They will roll 220 CFM into the the case as intake air, Roughly enough air to heat or cool 14' x 20' room with two windows ........
Neuro, Yes down firing intake This case it is the only logical way to cool it
I used to have a down firing system that was really efective back in the day, so thought I would roll with it again ....