if you think "chronic" (i assume you mean the specific type from serious seeds) smells, i grew chronic specifically because for skunk it is LOW odour, compared to the others that is.
you might as well buy a carbon filter, dont cut corners buy a branded guranteed one.
8inch carbon filter sucks the smell out my dog kennel, wet fur and all. 1 filter seems good for 1kg dry weed.
lemme compare chronic to what i grew after.. this shit now, an oz wrapped in 6 bags, an hour the stinks coming through, the chronic would be ok in perhaps 2 bags overnight.
i also blast more ventilation through the grow area, the 8 inch outflow is one of two, the filtered one vents directly outside the second gets cooled and recycled.
it is best to eliminate rather than mask the odour, and dont cut corners with your setup.
ive lost count how many people are busted through the SMELL!!!!!