This guide explains NFPA 80 clearance requirements at fire door heads, jambs, meeting edges and bottoms. It covers material-specific limits, accurate measurement methods, common causes of uneven gaps, approved repair considerations and the relationship between hinges, closers, coordinators, thresholds and seals in maintaining a functional fire door assembly.
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From a limited product range to a specification-ready architectural hardware portfolio with D&D HardwareD&D Hardware — Global Standards, Factory DirectExecutive answer: D&D helped the distributor consolidate certified product sourcing, private-label branding, technical documentation, packaging and h