This information has been updated to reflect the availability of CSI specs for UL555S Smoke Dampers:

UL555 & UL555S Combination Fire and Smoke Dampers

• FSD60 – 1.5 Hour, Class 1, Airfoil Blades
• FSD60-2 – 1.5 Hour, Class 2, Airfoil Blades
• FSD60-3 – 3 Hour, Class 1, Airfoil Blades
• FSD36 – 1.5 Hour, Class 2, Triple Vee Blades
• FSD35 – 1.5 Hour, Class 3, Triple Vee Blades

UL555 Dynamic Fire Dampers:

• DIBD10 – 1.5 hour, Dynamic Curtain Blade, Integral Angles
• DIBD2 – 1.5 hour, Dynamic Curtain Blade, Frame
• DIBD23 – 3 hour, Dynamic Curtain Blade, Frame
• DIBD20, 40 ,60 – 1.5 hour, Dynamic Curtain Blade, Integral Sleeves
• DIBD230, 430, 630 – 3 hour, Dynamic Curtain Blade, Integral Sleeves

UL555 Static Fire Dampers:

• IBD10 – 1.5 hour, Static Curtain Blade, Integral Angle
• IBD20, 40 ,60 – 1.5 hour, Static Curtain Blade, Integral Sleeves
• IBD2 – 1.5 hour, Static Curtain Blade, Frame
• IBD230, 430, 630 – 3 hour, Static Curtain Blade, Integral Sleeves
• IBD23 – 3 hour, Static Curtain Blade, Frame

UL555S Smoke Dampers

• SD60 – Class 1 – Airfoil Blades
• SD60-2 – Class 2 – Airfoil Blades
• SD37 – Class 1 – Airfoil/ 3V Blades
• SD36 – Class 2 – Triple Vee Blades
• SD35 – Class 3 – Triple Vee Blades
• SDRS25 – Class 1 – True Round
• SD50 – Class 1 – Aluminum Airfoil