HTD-621

The HTD-621 is a heavy duty industrial air control damper qualified for use in tunnel and transit systems. This model has a double flanged frame and features mechanically fastened silicone blade seals and stainless steel jamb seals.

Blade type: Single thickness flat blade with reinforcement
Pressure: Up to 24 in. wg
Velocity: Up to 4,000 fpm
Temperature: 250°F continuous; 482°F for 2 hours (NFPA 130 and 502)
Fatigue Cycles: 8 million reverse cycles at 24 in. wg

Tunnel Dampers

Damper Selection Guide

Which damper best fits the application? Greenheck’s damper interactive selection guide removes the guesswork. Find blade type, velocity, pressure, AMCA listings, submittals, drawings and more, all in one easy-to-use format.

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Certifications:

UL 555S (Listing # R13317)

Purchase Options:

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Codes:

National Fire Protection Association (NFPA 130 and 502)

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