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You have air in the lines and they need to be bled out.
Because it allows less air to move out of the building into the environment at any given time. If you open a door to walk in and it lead directly into the building you allow a large amount of air exchange to occur. However if you add another door and close the first door first (typlically accomplished in commercial structures with automatic door closers) the only air movement to the outside is the volume of air already in that area. Like an air lock.
Radon gas.
If its not a huge big coin - maybe a penny or so, it should fly right back into the building due to upward air pressure glidin up the walls of the building is stronger than the gravity pull.
It might. there might be some argument if the company is picky over the installation of it. If it was there when you moved in the building owner has to deal with it.