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thanks thats something I did not think of. do you think a speed switch on the can fan might help?

my grow room is 5ft x 5ft and 8 ft high running a 400 watt hid with an air cooled hood,and four sets total of 8- 42 watt cfl's. it has a small dedicated a/c unit mounted at floor level. I am able to keep the temp range between 72- 76 degrees. now the problem, over the last few grows the smell...