if you look through the data sheets of all the commonly used fans, the TD160 runs at a phenomenally low 18db, far lower than any others. No fan is completely silent - but if you suspend it with bungee, or wedge it in with chunks of foam rubber, it'll stop the vibration travelling into the woodwork! - beyond that, if you bury it inside the cupboard, sucking through a home made panel filter, with a short length of flexible ducting as outlet, they run nearly silently!