i have a very large cabinet humi...about 14 or 15 cu ft.....and i use about 2.0 pounds.....but i also use two original cigar oasis' strategically placed in my cabinet for air circulation and to avoid huge variances in humidity if i ahppen to be in it for awhile. i would definitely consider some sort of fan to keep the air moving in your humi. i am sure that it helps keep my smokes fresh and well humidified...i have tried it for extended periods of time with circulation of some sort and without. of course, as with almost everything else that has to do with cigars, opinions vary. good luck.