Description
GI NRD 150×150 Flange Type (Non-Return Damper)
The GI NRD 150×150 Flange Type is a galvanized iron non-return damper designed to prevent backflow of air in HVAC duct systems. With a square 150mm x 150mm dimension and flange-mounted frame, it allows air to flow in one direction while automatically closing to block reverse airflow. It’s ideal for ventilation systems that require pressure control and air integrity between zones.
Applications:
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Preventing reverse airflow in HVAC ducts
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Fresh air intake and exhaust systems
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Fan outlet protection
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Commercial kitchens, toilets, and exhaust systems
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Air pressure balancing in multi-zone ventilation
Features:
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Durable GI Construction: Made from corrosion-resistant galvanized iron for long-lasting performance
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Automatic Operation: Blades open with airflow and close automatically when airflow stops
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Flange Type Frame: Easy to mount between duct sections or wall openings
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Low Pressure Drop: Designed for minimal resistance to forward airflow
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Compact Size: 150x150mm is ideal for localized or small-area ventilation control
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Maintenance-Free: Simple mechanical design requires no power or manual adjustment
Specifications:
| Parameter | Details |
|---|---|
| Product Name | GI NRD (Non-Return Damper) |
| Type | Flange Mounted |
| Material | Galvanized Iron (GI) |
| Size | 150mm x 150mm |
| Operation | Gravity-operated blade |
| Installation | Flange type (bolted or sealed) |
| Airflow Direction | One-way only |
| Application Area | HVAC Ducts – Supply or Exhaust |
| Corrosion Resistance | Yes |
Frequently Asked Questions (FAQs):
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Does this NRD require any external power or control?
No, it operates mechanically using gravity or airflow pressure—no power needed. -
Can this be installed in vertical ducts?
Yes, but performance is best in horizontal airflow direction; vertical mounting may reduce effectiveness depending on blade design.
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