solomfg
That is how they work. Fog is heavier than air, so it just hovers at the bottom of wherever it is. I attached a few pictures of some forgers like that in action. The ultrasonic foggers don't produce a high water content fog, but the fact it has a higher water content than the surrounding air makes it heavier than air, so it drops. If you are wanting to use it to help humidify your small greenhouse, there are a couple of things you can do. First is raise the container with the fogger from the floor up near the top of the greenhouse, then the fog will have farther to drop, and more chance to mix with the surrounding air. Second is air movement, use a small fan to blow the fog around the room, that will mix the fog with the surrounding air in the room.
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