Grey-equalized noise at 3.3 with uniform grain, a fan on high in the next room
Preview plays right here. The generator adds a sleep timer, full controls, and WAV export.
Box Fan is exactly what it says: the rush of a cheap box fan on its highest setting, with a fine mechanical grain from the blades and the grille. It sits a little brighter than Airplane Cabin and has more texture, which makes it feel closer and more physical.
The color is 3.3, on the warm side of pink, with grey EQ enabled and the distribution set to uniform for that slight blade-chop grain. There is no pulse, and the fade-in is a single second, so it comes on almost as quickly as flicking a real fan switch.
This is the most common sleep sound in the world for a reason, and many people use this preset to replace an actual fan in winter. Airplane Cabin is the smoother, slightly warmer sibling, and CPU Fan is a much brighter, whinier small fan at 1.3.