The I/O means more design options!
Glass or panels can be positioned to the inboard (I) or outboard (O) side of the 4-1/2" depth frame to achieve the look you imagine. Typical glass thickness is 1", and can be installed from the outside or inside of the building. Special glazing pocket reducers allow the use of 1/4" infill thicknesses too.
14000 I/O Series thermal barrier insulates exterior surfaces from the interior to minimize temperature transfer. This provides industry accepted performance for CRF (condensation resistance) and Uc (conduction).
Using the same design, assembly, and accessories as the 14000 center glazed system allows combining inboard, outboard and center planes of glass in the same elevation, with the same great performance.