A window assembly for a wall opening can have a center bar removably engaged to a window assembly frame; the center bar having at least one deep channel to receive an edge of at least a first window pane within a portion of a channel depth on a first side and having at least a second channel on a second side of the center bar to receive an edge of a second window pane; and the center bar lowerable over the first window pane edge when disconnected to the frame to a depth within the deep channel to allow the second window pane to be disengaged from the second channel.