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Description:
Automatic fire damper – no power supply required
Fusible link melts at 74°C, instantly triggering damper closure
Effectively blocks fire and smoke from spreading through air ducts
Certified EI 30 – EI 120, compliant with QCVN 06 fire regulations
Strong spring-loaded closing mechanism, ensuring airtight sealing
Easy installation, compatible with both round and rectangular ducts
Suitable for projects requiring PCCC approval and inspection
More cost-effective than motorized fire dampers
Ideal for factories, shopping malls, and high-rise buildings
Parameter:
| Product code | GSC.FD-EI |
| Fusible Link Melting Temperature | 74°C |
| Metal Plate Material | Galvanized steel sheet |
| Test Standard | BS EN 15882-2:2015 ; ISO 10294 |
| Fire Resistance Rating | EI 30 - EI 45 - EI 60 - EI 90 |
The GSC FD Fire Damper is a basic and highly reliable passive fire protection device, designed to automatically prevent the spread of fire through HVAC ductwork. With a simple mechanical operating principle, it is an essential component in fire safety systems for buildings, factories, and commercial complexes.
Common product name: GSC FD Fusible Link Fire Damper
Typical model code: GSC.FD-EI
The primary role of the GSC FD Fire Damper is to automatically seal the air duct in the event of a fire, thereby:
Isolating the fire by preventing flame propagation through ventilation ducts
Blocking smoke and toxic gases, protecting evacuation routes and occupants
Maintaining fire-rated compartment integrity where ducts penetrate fire-rated walls or floors
The GSC FD Fire Damper operates fully mechanically, without any external power supply:
Under normal conditions, the damper blades are held open by a fusible link.
During a fire, the temperature inside the duct rises.
When the temperature reaches the melting point of the fusible link (typically 72°C – 74°C), the link melts and breaks.
The spring-loaded mechanism is released, instantly closing the damper blades.
The duct opening is sealed, effectively stopping the spread of fire.
This purely mechanical principle ensures high reliability, even during power failure.
The FD fire damper is widely used in:
Basement ventilation systems
Industrial factories and workshops
Shopping malls and commercial buildings
Technical rooms, storage areas, and high fire-risk zones
Projects requiring compliance with QCVN 06:2021/BXD
Its main function is to contain fire and smoke, preserve evacuation paths, and extend safe evacuation time.
Fail-safe mechanical operation
Works based on physical heat response, unaffected by electrical or control system failure
Durable construction
Damper casing and blades made of galvanized steel or stainless steel, offering high heat resistance
Fire resistance rating (EI)
Certified in accordance with QCVN 06:2021/BXD, available in:
EI 30 / EI 60 / EI 90 / EI 120
(Integrity & insulation maintained for 30–120 minutes)
Cost-effective solution
Lower initial investment and maintenance cost compared to motorized fire dampers (MFD)
| Duct Type | Recommended Model | Suitable EI Rating |
| Small round duct (Ø200–300) | GSC.FD-EI30 | EI 30 |
| Medium rectangular duct (500×300) | GSC.FD-EI60 | EI 60 |
| Floor-to-floor duct penetration | GSC.FD-EI90 / EI120 | EI 90–120 |
Selecting the correct damper model ensures effective fire protection and simplifies PCCC inspection and approval.
Although the FD damper operates automatically, regular inspection is essential to ensure long-term reliability.
Every 3 months for high fire-risk facilities
Every 6 months for standard buildings (offices, residential)
After any ductwork modification or renovation
Remove inspection access cover (if available)
Check that damper blades move freely and are not obstructed
Test fusible link (using approved test samples)
Clean dust and debris from blades and frame
Lightly lubricate blade shaft if necessary
⚠️ Important: Do not modify the fusible link or damper structure, as this may invalidate fire certification.
The FD fire damper must be replaced if:
The fusible link has melted after a fire event
Physical deformation due to impact or corrosion is observed
Damper blades do not close completely
Fire certification label or technical documentation is missing
Correct replacement with a certified EI-rated damper is mandatory for PCCC re-approval.
The GSC FD Fire Damper is a safe, economical, and regulation-compliant fire protection solution for HVAC systems. With a simple fusible link mechanism, certified EI fire resistance, and proven reliability, it plays a critical role in fire compartmentation and life safety.
Choosing a QCVN 06:2021/BXD certified FD fire damper and installing it correctly is one of the most effective ways to ensure successful PCCC acceptance and long-term fire safety performance.
