Spiral Duct Grille Damper – 525mm x 75mm

Spiral Duct Grille Sliding Damper – SGR-DA Type (Optional Rear Damper)

The SGR-DA Sliding Angle Damper is designed to fit directly behind spiral duct single-deflection grilles, providing simple and effective manual airflow control within round duct ventilation systems. It mounts neatly to the rear of the grille using clip-on brackets, allowing fast installation and easy adjustment on site.

Ideal for balancing airflow in both supply and extract applications, the sliding blade mechanism allows the opening to be increased or reduced as required without removing the grille assembly.

✅ Product Features

• Designed for use with spiral duct mounted grilles

• Rear-mounted sliding angle damper design

• Provides manual airflow balancing and regulation

• Clip-on fixing brackets for quick installation

• Adjustable opening to control airflow volume and throw

• Robust galvanised steel construction

• No welding required — corrosion-resistant finish

• Suitable for supply and extract ventilation systems

🔧 How It Works

The sliding closure plate moves across the angled damper grille to increase or restrict the free area behind the grille face. This allows installers to fine-tune airflow rate and distribution during commissioning or later system balancing.

Adjustment is simple and can be completed after installation.

📐 Available Damper Sizes (to suit grille sizes)

• 425 × 75 mm

• 525 x 75 mm

• 525 × 125 mm

• 625 × 225 mm

Damper sizes correspond to the matching grille length × height dimensions.

📞 Need help matching a grille or damper to your ductwork? Our team is ready to assist.