i got the 50 and it completely is eliminating ALL smell and it is over a year old. they work great and do the job, you just need to calculate your room size and go get the one that matches. i would definatly look at the dimensions and weight of the filter cause mine was bigger and way heavier than i expected. but if you do get an underrated combo for your room you will smell dank

Is there a calculation for sizing a room?

Yes there is and itā??s really quite simple, all you need to do is take your cubic feet of the room (Length x Width x Height) and divide that number by the number of minutes you would like to exchange the air in the room (Only 1 ā?? 3 Minutes is recommended) and that will give you the recommended minimum CFM that you need for that room, then you take that Min CFM number and match it to one of our filters and as long as that Minimum recommended CFM is higher then the exhaust minimum on the filter you will have adequate airflow and proper filtration for that room.