Hi, on inspecting a Emergency Exit door there is a blind present covering the whole door (to block out sunlight). Understandably this is in place due to a school classroom to block out sun but what is the clarification on A the signage being out of sight and B the blind blocking the exit in a panic situation? 

Any covering across the exit route that inhibits the means of escape, needs careful consideration, for instance door curtains in theatres or cinemas are not recommended, (places of assembly). However it is about fire risk assessment and you have to decide to what degree the MoE will be inhibited and what degree of hazard will exist. 

Without seeing the door and as you say "the signage being out of sight and the blind blocking the exit in a panic situation" it appears not acceptable.

Is it not possible to cover only the window itself?