For those of you who make your own carbon filters or even some of you that use ones you bought...try this. I made my own, stuff a ass load of dryer sheets into it and voila, no smell!! It smells like the hot air the dryer pumps out of your house. Since its int he filter where air blows out all of the time it wont cause your room to stink, only the exhausted air. Try it out, it really really works. Youll have to change the sheets every few weeks, but it works so amazingly well. Check out https://www.rollitup.org/indoor-growing/30622-my-little-babies-22.html#post340914 See the last pic, thats the homemade carbon filter. Inside of it is rain fresh dryer sheets. It smells like fresh laundry around the outside of the room. If anyone was to walk by (which they wont cause there are no neighbors) they would just smell fresh laundry being dried. I dont really ahve to worry about the smell anyways, i just wanted to see if it works and boy does it!!