A process for assembling a fire-, smoke-, sound- and/or water-proof system within a stick build exterior dynamic curtain wall façade or in a curtain wall assembly from unitized panels, wherein the process comprises the following steps: - assembling a framing structure by attaching anchoring brackets to horizontal and vertical framing members and to the concrete and steel members of the curtain wall façade to the building structure or to upper locations of the vertical framing member ready for mounting the finished unitized panel to the building structure; - providing the appropriate water gasket seals to the framing members, to seal the framing structure and building structure from water intrusion, wind, air, temperature; - positioning a tubular sealing element comprising a thermally resistant flexible foam material for insulating and sealing, in the safing slot extending between an interior wall surface of the curtain wall façade and an outer edge of the floor of the building structure, wherein the tubular sealing element includes: a) a bottom side cover; b) a top side cover; whereby the top side cover is connected at two positions, spatially disposed from each other, to the bottom side cover; and whereby the bottom side cover and the top side cover surround the thermally resistant flexible foam material; c) a first connection area for attaching the tubular sealing element to the interior wall surface of the curtain wall construction; and d) a second connection area for attaching the tubular sealing element to the outer edge of the floor; - fixing the first connection area and the second connection area of the tubular sealing element to the curtain wall façade and to the building structure to achieve a firm seal of the safing slot; and - applying a watertight seal at each seam, splice or butt joint between adjacent tubular sealing elements and around each bracket. - assembling a framing structure by attaching anchoring brackets to horizontal and vertical framing members and to the concrete and steel members of the curtain wall façade to the building structure or to upper locations of the vertical framing member ready for mounting the finished unitized panel to the building structure; - providing the appropriate water gasket seals to the framing members, to seal the framing structure and building structure from water intrusion, wind, air, temperature; - positioning a tubular sealing element comprising a thermally resistant flexible foam material for insulating and sealing, in the safing slot extending between an interior wall surface of the curtain wall façade and an outer edge of the floor of the building structure, wherein the tubular sealing element includes: a) a bottom side cover; b) a top side cover; whereby the top side cover is connected at two positions, spatially disposed from each other, to the bottom side cover; and whereby the bottom side cover and the top side cover surround the thermally resistant flexible foam material; c) a first connection area for attaching the tubular sealing element to the interior wall surface of the curtain wall construction; and d) a second connection area for attaching the tubular sealing element to the outer edge of the floor; a) a bottom side cover; b) a top side cover; whereby the top side cover is connected at two positions, spatially disposed from each other, to the bottom side cover; and whereby the bottom side cover and the top side cover surround the thermally resistant flexible foam material; c) a first connection area for attaching the tubular sealing element to the interior wall surface of the curtain wall construction; and d) a second connection area for attaching the tubular sealing element to the outer edge of the floor; - fixing the first connection area and the second connection area of the tubular sealing element to the curtain wall façade and to the building structure to achieve a firm seal of the safing slot; and - applying a watertight seal at each seam, splice or butt joint between adjacent tubular sealing elements and around each bracket.