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Half life 2 beta air exchanger (old v.)

This is the oldest and very first version of the air exchanger. I tried to transfer it to Gmod but it didn’t turn out very beautifully. There are no NPCs on the original map, only a few Odell models for measuring height. I added an NPC here. At the end, you will see empty ventilation grilles, followed by the rest of the level that you could go through in my previous map. It turns out that here only the beginning has changed. Yet I tried.