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The Sigrist NRD-150 is a 150mm metal non-return damper for ducted ventilation and HVAC airflow systems. It fits standard 150mm round ducting and allows air to move in one direction only, closing against backdraft once the fan stops. A soft close buffer built into the NRD-150 slows the closing action and cuts the slamming noise common to plain gravity dampers.
Exhaust and inline fans on a 150mm run push air one way while running, but leave an open path back through the duct the moment they switch off. That open path lets cold outside air, odours, and insects track back into the room. A non-return damper sits in the run and closes against reverse flow, so the duct only carries air in the intended direction and holds that one-way airflow on the whole 150mm line.
Installers fit the NRD-150 inline on a 150mm duct to finish a bathroom, laundry, or inline fan run without call-backs over draughts or duct noise. The metal body holds shape on longer runs where light plastic flaps can warp or rattle. The soft close buffer keeps the damper quiet, which matters on bathroom and bedroom exhausts that run late at night.
The NRD-150 is sized for 150mm ducting and does not fit other duct diameters without a separate reducer or adaptor. It is a passive backdraft damper, not a powered fan, so it relies on a connected fan for airflow and does not form an airtight or fire-rated seal.
(NRD-150)
The Sigrist NRD-150 is used to stop unwanted backdraft and reverse airflow in ventilation and ducted exhaust systems.
It allows air to flow in one direction only and helps stop air returning back through the duct.
It can help reduce outside air, odours and unwanted airflow entering the system when the fan is off.
Yes. It helps reduce slamming noise when the airflow stops.
Yes. It’s commonly installed with exhaust and inline ventilation systems.
Yes. Sparky Direct stocks the Sigrist NRD-150 with fast dispatch across Australia.
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Warranty starts from Invoice Date
Domestic Use: 2 Year
Commercial Use: 2 Year
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These specifications and characteristics outline physical, mechanical, electrical details.
| Brand | Sigrist Design |
| SKU | NRD-150 |
| Model # | NRD-150 |
| Barcode # | 2000000013169 |
| Package Weight | 1.530kg |
| TYPE | VALUE |
|---|---|
| Type | Duct Valve |
| Brand | Sigrist |
| Material | Metal |
| Diameter (mm) | 150 |
Electrical and HVAC products sold by Sparky Direct are intended for installation by licensed and appropriately qualified professionals in accordance with applicable Australian Standards and regulatory requirements. Customers are responsible for ensuring that any product purchased, including any related or associated components, is compatible and suitable for their intended installation and application.
Sparky Direct does not provide installation advice and does not assess product suitability for individual circumstances unless expressly confirmed in writing. Customers must confirm correct product selection, compatibility, compliance, and suitability with a licensed or appropriately qualified professional prior to purchase.
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