There are two types of emergency egress windows. One will have a clamp type over center clamp. These do not open unless there is an emergency; there are no screen on these windows. The other type will have a screen on the window with a bar that will clamp in place and can be pivoted to open. These I always open and use since they are designed for that purpose.
2016 34RL CC; 2008 Ram Mega Cab 2500HD, 6.7L, 68RFE 6 speed, 4X4, Smarty S67, TDR 135K+miles