31’ VS1-A220 lobby curtain wall replaces the typical offset between the VS1 mullion and the face glass with a continuous vertical aluminum cassette. Toggle clips connect to the IGU within the cassette channel, allowing for standard IGUs to be used. The cassette system methodology is known industry-wide for simplicity of installation. It is also cost-effective and creates a clean curtain wall aesthetic with a pure expression of glass through VS1’s typical frameless horizontal joint approach.