Maybe I misunderstood the original post, but the part about ventilation makes me think you don't understand that the seed must be sown, germinated, and grown for a while in a completely sealed, sterile environment.
If you sow the seed in a non-sterile environment, molds will germinate in the nutrient-rich substrate and overwhelm the orchid seed.
If, on the other hand, you're referring to buying a flask of seedlings, it is common to "harden them up" after removing them from the flask (100% RH) and potting them, by keeping the pots in closed plastic bags for a while, then open them up gradually for longer and longer periods of time, so they get adjusted to the lower humidity.
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