This assembly details a backdraft damper jamb supported by a two-by-two inch horizontal hollow structural section member spanning between vertical structural mullions. A bird screen is secured to the horizontal hollow structural section using one-way security fasteners. The exposed steel members are coated with polymethyl methacrylate liquid flashing at the base. Structural connections utilize acrylic-coated structural fastener Tek screws to attach the damper to the embedded steel, jamb, and header. Finish requirements for the damper support framing steel are specified in the sector floor plans.
SHEET METAL FLASHING AT SILL, SEE DAMPER SILL DETAIL. STRUCTURAL HSS MULLION. REF: STRUCTURAL SCHEDULED BACKDRAFT DAMPER. ANCHOR TO EMBEDDED STEEL AND TILT JAMB AND HEADER. REF: STRUC AND MECH. BIRD SCREEN ANCHORED TO 2X2 HORIZONTAL HSS WITH ONE-WAY SECURITY FASTENERS. 07 A-60009 PMMA LIQUID FLASHING AT BASE OF EXPOSED STEEL MEMBERS ACR COATED STRUCTURAL FASTENER TEK SCREWS. REFER TO SECTOR FLOOR PLANS (A-20000 SERIES) FOR FINISH APPLIED TO DAMPER SUPPORT FRAMING STEEL, TYP. 2X2 HSS HORIZONTAL MEMBER BETWEEN VERTICAL HSS SUPPORTS. AS REQUIRED FOR ATTACHMENT FOR MAX BIRD SCREEN SIZE. RE: STRUC FOR ATTACHMENT
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