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Damper ratings shall be in accordance with Sections 717.3.2.1 through 717.3.2.4.
717.3.2.1 Fire Damper Ratings
Fire dampers shall have the minimum rating specified in Table 717.3.2.1.
TABLE 717.3.2.1
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
717.3.2.2 Smoke Damper Ratings
Smoke damper leakage ratings shall be Class I or II. Elevated temperature ratings shall be not less than 250°F (121°C).
717.3.2.3 Combination Fire/Smoke Damper Ratings
Combination fire/smoke dampers shall have the minimum rating specified for fire dampers in Table 717.3.2.1 and shall have the minimum rating specified for smoke dampers in Section 717.3.2.2.
717.3.2.4 Corridor Damper Ratings
Corridor dampers shall have the following minimum ratings:
  1. One-hour fire-resistance rating.
  2. Class I or II leakage rating as specified in Section 717.3.2.2.

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