---
title: Louvers and Dampers
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label: Minimum Certified Free Area
type: range
−unit: % of gross wall opening
+unit: '% of gross wall opening'
options:
min: 35
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### Any life-safety damper that fails to operate as listed, and any control damper that fails to achieve its specified leakage class at full closure, shall be corrected at the Contractor's expense.