I am using a 4*4 tent there are 10 plants and the filter is 5" the fan was a 5" but I upgraded it to a 6" centrifugal fan.This is my first grow so I am still learning any advise is welcomed.
How long should a carbon filter last for mine has been running for about 11 weeks now and is not has efficient. The plants have 1 week left before cropping and I have noticed a strong smell of weed where I have them vented to.