YOW 350 T Mullion Options- These charts are intended for preliminary application. For detailed analysis, contact YKK AP Engineering at 1-800-955-9551. STACKING MULLION CL BE9-5220 BE9-5220 & BE9-4902 ft 12 10 8 A BE9-4902 6 B C D 1/8" [3.2mm] FRAME WIDTH (w1) FRAME WIDTH (w2) 4 3 4 5 6 7 8 ft A=35 PSF (1676 Pa) C=65 PSF (3112 Pa) B=50 PSF (2394 Pa) D=80 PSF (3830 Pa) Page-38 05-1007-15 | Effective Date: October 1, 2020