YES 45 FS/FI Outside or Inside Glazed, Center Set Storefront Systems STOREFRONT SYSTEM Product Description The YES 45 FS (1-3/4 " x 4-1/2 " ) is a center set, flush glazed framing system designed primarily for 1/4 " glass or infill panels 1/4 " to 3/8 " thick. YES 45 FI (2 " x 4-1/2 " ) is a center set, flush glazed framing system developed for 1 " insulating glass and other types of infill panels of varying thicknesses. Both systems will accommodate YKK AP's hinged mullion, as well as our flexible mullion; these mullions allow more creative freedom where curves and angles become a functional part of the design. Product Options & Features n Outside or Inside Glazed n Screw Spline and Shear Block Assembly n Gasket With Stretch-Resistant Cord n Integral Entrance Door Frames n Enhanced Water Infiltration Resistance n Integrates with Model 20D/35D/50D Doors