6" x 4" MODEL 151A DYNAMIC FIRE DAMPER - NO SLEEVE

Meets All Ul And Nfpa Requirements For Primary Fire Dampers.
Approved For Use Where Ducts Penetrate Partitions With Fire Resistance Ratings Of Two Hours Or Less.

1 1 /2 Hour Rating, For Use In Fire Barriers Rated For 2 Hours Or Less.
6" X 6" Minimum / 24" X 24" Maximum Unit Dimensions,
Options: Custom Sizes Available