Protection and Reliability of Micro Actuators (IP Rating)

From what I’ve seen, the protection level really depends on the specific model, but a lot of the tiny ones hold up better than people expect. I’ve used a few micro units when modifying a small CNC enclosure, and they dealt with fine dust surprisingly well. I’d still keep them away from direct water spray, though. If you’re comparing options, the specs on mini actuators https://www.progressiveautomations.com/pages/micro-linear-actuators give a decent idea of how different micro actuators are built. For greenhouse humidity, I’d probably make a simple shield or housing just to be safe, even if the IP rating looks good.