Exactly as AND says above mate
The negative pressure is caused by your extraction fan. Your tent is sealed and the extraction is constantly exchanging air. (Stale air out fresh air in) It should always remove more air out than its pulling in. This is known as negative pressure and by doing so it allows all stale air to pass through your carbon filter which In turn removes pretty much all risky smells with no leaks.
Due to this negative pressure it’s constantly pulling your tent sides in, so let’s say you have a 1.2 tent. With the air pull the actual space inside your tent will most likely be around 1.0 x 1.0 or maybe 1.1 x 1.1 as the air pull draws your tent sides in tight to your tent poles. So a 1m parabolic will be a like for like size and will be a very tight fit with no room for air movement to pass through your area. Heat rises so you need space for the lower heat to reach the top and leave via your extraction keeping your temps in check.
As for the bungees they attach on the poles inside, corner to corner. They have to be pulled and fastened really tight to take effect. Garden canes or planks of wood work in the same way
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