So i have a 400 w cooltube 6 inch inline fan 250 cfm 4inch inline 150 cfm 6 inch at the top 4 inch at the bottom i have the 6 inch exhausting air into the cool tube and out the window with aircon in the room that my tent is in the tent is 80cmx80cmx160cm / 31"x31"x62" what am i doing wrong my tent is sucking in?