Partitioning sash

A partitioning sash having a width and a depth comprising

• at least one multi window tubular mullion for forming a multiple window portion of said sash, said multi window mullion having glass receptacle grooves on opposite side surfaces situated at both spaced sides in a first direction parallel to the width of said sash;
• at lease one salient corner mullion for forming a salient angle portion of said sash, said salient corner mullion having a salient corner mullion tubular body and a salient corner mullion auxiliary frame body, said salient corner mullion tubular body having a first glass receptacle groove on a side surface situated at a first side in said first direction, said salient corner mullion auxiliary frame body having a second glass receptacle groove on a side surface situated at a first side in a second direction parallel to the depth of said sash, said salient corner mullion tubular body and said salient corner mullion auxiliary frame body being coupled with each other such that a side surface of said salient corner mullion auxiliary frame body positioned at a second side in said second direction is fixed to a side surface of said salient corner mullion tubular body positioned at said first side in said second direction, a dimension of said salient corner mullion measured in said first direction being equal to a dimension of said multi window mullion measured in said first direction;
• at least one reentrant corner mullion for forming a reentrant angle portion of said sash, said reentrant corner mullion having a reentrant corner mullion tubular body and a reentrant corner mullion auxiliary frame body, said reentrant corner mullion tubular body having a first glass receptacle groove on a side surface situated at a second side opposite to said first side in said first direction said reentrant corner mullion auxiliary frame body having a second glass receptacle groove on a side surface situated at a second side opposite to said first side in said second direction, said reentrant corner mullion tubular body and said reentrant corner mullion auxiliary frame body being coupled with each other such that a side surface of said reentrant corner mullion auxiliary frame body positioned at said first side in said second direction is fixed to a side surface of said reentrant corner mullion tubular body situated at said second side in said second direction, a dimension of said reentrant corner mullion measured in said first direction being equal to said dimension of said multi window mullion measured in said first direction;
• upper and lower horizontal members fitted between each two adjacent mullions of said multi window, salient corner and reentrant corner mullions, thereby forming a sash frame having a plurality of quadrangular frame portions;
• and
• glasses installed in said quadrangular frame portions.