The YES 600 is a thermally broken, front loaded storefront system for 1" insulated glass.  This outside glazed system also accepts 1/4" monolithic glass with glazing adaptors.  The thermal break is achieved by employing a unique nylon chip that locks the exterior and interior members together.  The face cover is inserted into the other end of the mullion through the clip with gaskets attached securing the glass to the system and locking the cover with the mullion.  The nylon clip also helps reduce the amount of heat transfer that conducts through the storefront.  This method of attaching face members also allows separate finishes to be used on the system.