Getting some windows from work for free

We're doing a renovation project where I work and there are a few pieces of glass from windows that they said I can take home. They're roughly 2 X 4 feet. I'm not sure if they're argon filled, but they're definitely two pieces of glass seperated by some gap, be it air or some other gas. I'd like some advice from you guys on this. I'd like to secure these in the three doors I have yet to install. If I can seal up all the edges well enough, how much of a decrease in my TL can I expect? And exactly what do I need to give you guys for you to tell me that? Thickness of glass and if it's air or gas between the galss? I'm willing to give up a little bit of tramission loss for the convenience of not getting smacked in the face every time a door opens up. At this point I've installed one door and when there are 3 or 4 people down there, we've resorted to yelling "DOOR!" when we're about to open one because of all the times we've been taken by surprise. Between my control room and live room I have an "air lock" room. One door goes from the CR to the AL room, and from the AL room to the LR I'm hoping to have a double door, so that's three doors between the CR and LR. I'm thinking any decrease in my TL will be so minimal I won't really notice too much. For the actual door material I'm going to go with solid core interior doors, and I'll cut into them to fit the glass in. I've built two doors alread from regular construction materials, and needless to say, it's a pain in the ass, which is why for the remaining doors I'm going with oak.