Thermal and acoustic insulating and sealing system for a safing slot in a curtain wall

Described is a construction and parts of the construction for effectively thermally and acoustically insulating and sealing of a safing slot between a floor of a building and an exterior wall construction wherein the exterior wall construction comprises a curtain wall configuration utilizing an interior panel module design. In particular, the thermal insulating and sealing system comprises a first element comprising a cavity having an interior wall surface and an opening, positioned substantially in the height of the floor, wherein the cavity is located in the spandrel area of the interior wall surface, and a second element comprised of a thermally resistant and/or air tight material for insulating, positioned at least partially in the cavity of the first element, wherein the second element includes an inner end surface positionable in abutment with respect to the outer edge of the floor for sealing there adjacent, outer end surface positionable in abutment with respect the interior wall surface of the cavity, a lower facing surface extending between the inner end surface and the outer end surface and facing downwardly therebetween, and an upper facing surface extending between the inner end surface and the outer end surface and facing upwardly therebetween.