not a window fan, but consider https://www.amazon.com/Caframo-Ultimate-Direct-Cabin-White/dp/B0016013JK/ref=sr_1_15?dchild=1&keywords=caframo+fans&qid=1591992348&sr=8-15 - these are extremely popular among sailboaters. They are quiet and move good amount of air. You can put your finger right into the blade and it won't hurt a thing (though it will wrap up long silky hair pretty annoyingly).