Well, just for the sake of pedantry, Tim.... the chord name Em7sus4 doesn't make sense. The "sus4" means that the 3rd is replaced totally by the suspended 4th note, so that considering the third, whether flatted or not, is a non-sequitor. The real name for the chord would be Esus4, containing the notes E, A and B. And Amos gave you the correct fingering for that one above.