Air Control on Large Ships

Hello everyone, Doing a bit more work on the big carrier I'm designing to use with a friend and I've sealed up the hangar-areas but now I've got a new problem: I've got a 23 block long door that could potentially vent a painful amount of oxygen into space. I don't want to scrap the door because I think it's cool (and very loosely taking inspiration from the Venator Class Star Destroyer from Star Wars), and I think it'll be reasonably 'practical' way of handling the positioning of the hangars. So I'm considering two fixes:

1. Either keep this section depressurized always but allow the hangars to pressurize or
2. Build a system such that the big area will decompress via vents before the door opens.

I think Option 2 would be better but I really don't know how to do much in the way of automation and the airlock videos I've seen seem to rely on timer blocks which would mean that I'd need to time the depressurization of a massive room... Is there any way I can just detect when the pressure is at 0% or some other workaround? Any guidance on this problem would be very helpful.

Also for context the room this door is to is a bit above 11,250 cubic meters in volume. Getting an accurate measurement is a little difficult do to an irregularly shaped device I've built in it. I'm having a hard time finding rates for things when I go looking so I'm not sure how many vents I'd need to depressurize this in a reasonable period of time.