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MECHANICAL FIRE DAMPER
UL 555 Classified · FFD (vs) Curtain Fire Damper
Closes on a 74°C (165°F) fusible link, driven by stainless steel closure springs.
1.2 mm galvanised steel frame with 0.8 mm interlocking galvanised steel blades.
Complies with NFPA 90A and SMACNA requirements.
Rectangular as standard, with an optional version for round ducts.
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UL 555
CLASSIFIED -
1½ & 3 hour
FIRE RATINGS -
100%
FREE AREA -
File R27369
UL LISTING
UL 555 Classified – FD (VS) Curtain Fire Damper
Curtain blade fire damper for static HVAC systems, with blades stored outside the airstream for 100% free area.
UL 555 tested for 1 hour and 3 hour fire ratings.
Closes on a 74°C (165°F) fusible link, driven by stainless steel closure springs.
1.2 mm galvanised steel frame with 0.8 mm interlocking galvanised steel blades.
Complies with NFPA 90A and SMACNA requirements.
Rectangular as standard, with an optional version for round ducts.
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FlameSafe Fire Dampers catalogue, Sep 2025 v1 – FD (VS) on pp. 4–6
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Installation
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