Hollow Metal Door Core Types: Honeycomb, Polystyrene and Steel-Stiffened
Compare honeycomb, polystyrene, polyurethane, steel-stiffened and temperature-rise cores for hollow metal doors.
Steel Door Gauge Thickness: 14, 16, 18 and 20 Gauge Explained
Understand steel door gauge thickness, the SDI decimal references for 14, 16, 18 and 20 gauge, and what to specify for commercial openings.
Smoke Door vs Fire Door: Ratings, Seals and Hardware Differences
Compare smoke doors and fire doors by performance objective, labels, seals, closing, latching and hardware coordination.
Fire Door Gaps and Clearances: How to Review Head, Jamb and Bottom Gaps
Learn how to review fire door gaps at the head, jambs, meeting edges and bottom using consistent measurements and the approved assembly requirements.
Fire Door Inspection Checklist: What to Check Before an AHJ Visit
Use this fire door inspection checklist to review labels, clearances, hardware, glazing, closing, latching and field modifications before an AHJ visit.
Commercial Door Submittal Package: A Practical Checklist Before Release to Production
A commercial door package rarely fails because a buyer chose the wrong product name. More often, the problem starts earlier: