na just some after the fan then halfway in duckting then at the end blowing over ona gel all gd a cant smell anything at all until I open the tent n I got a copper down stairs n my landlord straight across from me all in the same stair well no smell lol cheap cf I can shake the carbon around so its not so compact I'm just using a budha cf 4inch atm there £20 n ona gellIt's getting the packing tight enough which is the real problem unless you have the right equipment