My room is 11x14x10 right now im only running a 1000w and a 600w and im using a 435cfm fan ( I just moved upgrading this week I know this is not adequate ) I will be running 6x600's and will be venting to a roof using a 10in square vent pipe that is permanent in my building...thats the problem im not sure if using a 12in max fan 1700cfm will be to much pressure on the 10 in pipe .. in the room I will have 2 rows of 600s 3 in each row and I will use a split.... Any Venting pros out there wanna help.. the next size fan down is the 10 in max fan like 1200cfm i think.... also I have a 6 in fresh air duct that is filtered for an intake I plan on moving the 435 cfm fan to the intake.... I will have at least 4 of the six light up this week