Attachment 6. Drawings.pdf

These are technical architectural drawing sheets for 15-minute fire-rated/blast-resistant (FE/BR) duct penetrations and wall upgrades for the U.S. Department of State's Overseas Buildings Operations. The drawings were issued in September 2022 and cover OBO/SEB security details.

The document provides detailed construction specifications and cross-sectional diagrams for four primary configurations: (1) FE/BR duct penetration using rebar in wall conditions with both rebar-in-wall and grille-mounted protected-side options; (2) 150mm, 200mm, and 250mm concrete wall sections for retrofit conditions, each showing placement of steel channels, expansion anchors, and reinforcing steel; and (3) an upgrade detail for existing hollow masonry walls to 15-minute FE/BR criteria. Material specifications throughout include reinforced steel with minimum yield strengths of 250-420 MPa, concrete with minimum compressive strength of 30 MPa, and steel plate angles with minimum yield of 345 MPa. All drawings specify dimensional tolerances in millimeters with acceptable IP conversions in parentheses. Key components include ∅10-∅16 expansion anchors at 125-450 on-center spacing, continuous steel angle frame members welded to vertical rebar, sheet metal duct attachments via SMACNA standards, and grille designs per specified details. The drawings indicate both "attack side" and "protected side" designations for security purposes and note that duct penetrations must be concealed above finished ceilings and transit horizontally rather than vertically.