We actually have LO sleeping in her swing (not turned on) so that she can be a bit more upright since she's congested, and we have the swing right in front of her crib, and the humidifier is on the floor at the foot of the crib.
Warning
No formatter is installed for the format bbhtml
Re: If you use...
about two feet from the crib on a small table.
Edit: Oh wait I just remembered that ours is a warm mist humidifier.