4inch exhaust fan out same in . The towel brought it up to 60 exactly what I needed. Bro it’s in my bedroom and I’ve small babies n kids so I have to work around them. Just because I’m up at 4.30 they don’t need to be. I get it got to keep it clean and orderly . Working round kids , you get . Very grateful for your input keep it coming ok broYeah, the wet towel can work, but you've got to do more than one and you have to keep rewetting them. Are you running a regular type exhaust fan? I've got hygrometers on my fans, so they'll only come on to exhaust excess moisture. You set it to an upper limit, humidity builds, fan kicks on, goes off when it drops back down. Like this: Amazon.com