OPENING WIDTHS ARE COMPUTED AS FOLLOWS-(HEIGHTS ARE STANDARD) Sash Opening Width The sum of the individual sashopenings plus 4% for eachLoad-Bearing Mullion. Stud Opening Width The overall Sash Openingplus 3V4. Masonry Opening Width The overall Sash Openingplus 41/2. DOOR FRAME WITH FLANKING… … One or more Casementsmay be used as Flankerson either or both sides ofStandard Door Frames. A practical installationmethod is detailed. A 5/16 X IVs Filler Pieceas shown in Section A isrecommended across theDoor Frame.