Figure 4, In. (6mm) bolts and nuts, Figure 5 – Greenheck Multi-blade Fire & Combination Fire Smoke Dampers Installation Booklet (826249) User Manual

DFDR Fire Dampers (462721), CFSD-XXX Series, FSD-XXX, DFD-XXX, OFSD-XXX, ODFD-XXX, OFD-XXX, OSSFD-XXX, FSD-3XXV, FSDR-XXX, SEFSDR-XXX, SSFSDR-XXX, GFSD, Single Side Retaining Angle