Studies conducted at the IFA into a number of case scenarios have shown that combinations of respiratory protective equipment and PPE against falls from a height are subject to certain serious constraints in their protective action (DGUV Regel 112-198 (to date: BGR/GUV-R 198) governing the use of personal protective equipment against falls from a height, March 2011, Section 5.3.1.5 at action www.dguv.de/fb-psa, in German).