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Door Gaps & Tolerances
Perimeter gaps
Correct door gaps are essential for fire door performance, smoke control and reliable operation. This section explains perimeter gaps, threshold clearances, measuring techniques, acceptable tolerances and practical methods for correcting common issues found during installation and inspection.
PROUDMAN
Door Gaps & Tolerances
Fire Door Gaps Explained: Inspection, Measurement and Common Problems
Published: July 16, 2026
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