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  1. FIREDAMPER22

    FIRE AND SMOKE DAMPERS

    Does anyone know if a class 0 leakage fire and smoke damper exists ? I only know of class 1 thru 3 leakage ratings for fire and smoke dampers.
  2. FIREDAMPER22

    UL 555C fire dampers

    Is anyone familiar with UL 555C as it relates to fire dampers ?

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