STEEL SYSTEMS JANISOL C4 EI60/EI90 27 Example of Janisol C4 EI60/EI30 (70 mm) A-A 50 20 20 50 10 50 20 20 50 10 50 20 20 50 B-B C - C 50 20 20 50 10 50 20 A A EI60 EI60 20 B B C C 50 EI60 EI30 EI60 EI60 EI30 EI30 EI60 22.5 A A