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APPLICATION

The Model KSD-333 is a UL555S Classified smoke damper designed for use in dynamic smoke management systems or other applications requiring ultra-low leakage performance.
It provides operation and dynamic closure for vertical or horizontal mounting with airflow from either direction.

Performance Ratings:

• Max Static Pressure: Up to 4” W.G (1000 Pa)

• Max Velocity: Up to 4000 FPM (20.3 m/s)

• Operating Temperature: Up to 350°F (177°C)

This model is compatible with a wide range of HVAC air conditioners, offering reliable air distribution and control solutions for modern building systems.

STANDARD CONSTRUCTION

• Frame: 16 gauge (1.6 mm) galvanized steel, interlocking hat-section channel frame construction.

• Blades: 16 gauge (1.6 mm) galvanized, 3 “V” formed.

• Bearings: Sintered bronze, oil-impregnated.

• Axles: 1/2″ (12.7 mm) square zinc-plated steel studs.

• Linkage: 0.12″ × 0.50″ (3 × 12.7 mm) zinc-plated steel, concealed within the channel frame.

• Finish: Mill galvanized.

• Blade Seals: Silicone edge type for smoke seal up to 450°F (232°C).

• Jamb Seals: 300 series stainless steel, flexible metal compression type.

• Jack Shaft: 1/2″ (12.7 mm) diameter zinc-plated steel with connector coupling.

• Actuator: Electric spring return (230 V, 120 V, or 24 V) and pneumatic options available.

• Caulking: UL-approved silicone sealants: Dow Corning RTV-732, Nuflex 302.

• Sleeves: Rectangular construction.

SIZE RANGE

• Minimum Size (Single Section): 8″ × 8″ (203 × 203 mm)

• Maximum Size (Single Section): 36″ × 36″ (914 × 914 mm)

FEATURES

• UL555S Classified Smoke Damper label for dynamic system use.

• Meets NFPA 90A, 92A & 92B criteria for smoke dampers.

OPTIONS

• Bearings: Stainless steel.

• Actuator Mounting: External & internal.

• Optional Material: Stainless steel construction.

• Sleeves: Round, oval, and special configurations.

NOTES

• Dampers are furnished approximately 1/4″ (6 mm) smaller than given duct dimensions.

• Refer to the Installation Instruction and supplements for full installation details.