Only one way out

Ok, this is a poll that is a little different... Well, let me tell you the story...

One morning you wake up with that odd feeling that something is wrong. Then you notice it, you don't know where you are, in fact, you have never seen this place or any place like it before. Being in such a different place has put all your senses on alert, and you are wide awake almost immediately.
You look around you... you are in a dome shaped chamber, the walls and floor are smooth and completely grey. The only things that stand out are an envelope at your feet, the vent directly above your head and the four unmatching doors across from eachother around the dome.
Of course, the first thing you do is to pick up the envelope. Inside of the envelope is a letter, which you proptly begin to read.
"In this dome there are four doors, each will take you to a different surprise, you have all the time in the world to come up with your decision. I wish you luck, choose wisely."
You find yourself with no choice but to make a decision of your way out. So you sit for what seems like forever, studying your surroundings.

You notice that each door has a number. Door 1, Door 2, Door 3, and Door 4.

Door 1 looks like a plain wooden apartment building door, pained white.

Door 2 looks like it is made of titanium, and has a regular pull handle.

Door 3 looks the same as Door 1, except that it is black, and opens on the wrong side.

Door 4 is really double doors, and in an arch.

Besides the doors though, the vent above your head is withing jumping reach... if you could pull the metal frame down, you could try making your way out there.

Make your choice.