Next best place to vent the exhaust air

Im growing in a closest and do not have a window nor chimney that i can have my air exhausting out of. Is there a box or something i can build that i could have it exhaust into and so it doesnt smell? I do have a filter in the growroom... so will i even hav to worry about smell coming out of the exhaust. What should i do. I hav come to far to give up.

Ya man just build a box, add an exhuast fan, attach your carbon filter and voila. no smell, and an enclosed grow.