Ok I have a grow lab 60 tent its 2ft x2ft x5ft 3inches. What would be my best bet for a carbon filter and fan.I was thinking the can filter 2600 with the can-fan 4 with a speed controler. My question is since my tent is only 21 cubic feet will this combo work as it would be exchanging the air in the tent alot? My concern is that the air exchange rate will prevent my fan/filter combo from doing its job.