Ruskin - The FSD36 Combination Fire/Smoke Damper is both UL555 and UL555S Classified, rated as a 1.5 hour fire damper and a Leakage Class II Smoke damper https://bddy.me/33mSEMK | Facebook
CD36CE : Critical Environment Damper: 316 Stainless Steel, Rectangular, V-Groove, Class II Leakage, Medium Duty, 3000 FPM, 5" w.c. Max
![Ruskin Life Safety Damper Actuator Relocation for External to Internal - Dampers under 21” - YouTube Ruskin Life Safety Damper Actuator Relocation for External to Internal - Dampers under 21” - YouTube](https://i.ytimg.com/vi/t4BPyExn0Tc/sddefault.jpg)