Osmotic Field
this form of portal shielding was used to maintain a certain level of atmospheric conditions within a room or building. When placed at a doorway or other entrance, the osmotic field could be tuned allow air but not particulate matter - including insects and larger creatures - pass through it into the room. More advanced models also had entropic overlays that pulled energy from the incoming air, thereby cooling it and dropping the temperature within the room. Despite the tuning that could be done with osmotic field, it was virtually harmless to most sentient races, which could push through the field to enter the room with minimal effort.
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