YOW 350 T Mullion Options These charts are intended for preliminary application. For detailed analysis, contact YKK AP Engineering at 1-800-955-9551. CL BE9-5220 ft STACKING MULLION BE9-5220& BE9-4902 10 12 BE9-4902 1/8 " [3.2mm] FRAME WIDTH (w1) FRAME WIDTH (w2) 4 6 8 A B C D 34 56 78 ft A=35 PSF (1676 Pa) B=50 PSF (2394 Pa) C=65 PSF (3112 Pa) D=80 PSF (3830 Pa) Page-38 05-1007-16 | Effective Date: April 26, 2021