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717.3.2.1 Fire Damper Ratings

Building Code 2018 of Illinois > 7 Fire and Smoke Protection Features > 717 Ducts and Air Transfer Openings > 717.3 Damper Testing, Ratings and Actuation > 717.3.2 Damper Rating > 717.3.2.1 Fire Damper Ratings

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Fire dampers shall have the minimum rating specified in Table 717.3.2.1.

TABLE 717.3.2.1
FIRE DAMPER RATING
TYPE OF PENETRATION	MINIMUM DAMPER RATING (hours)
Less than 3-hour fire-resistance-rated assemblies	1.5
3-hour or greater fire-resistance-rated assemblies	3

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