Ductsure Door Relief Vent Grille (Anodized Aluminium) – DG-A 400200 Insize 90° Flat Edge Square 150x100mm Range Series 4792-150 Best Carbide carbide burrs are

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Size is 40mm initial which will screw down to 25mm

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Extension rod – 1 pc

Ductsure Door Relief Vent Grille (Anodized Aluminium) – DG-A 400200 Insize 90° Flat Edge Square 150x100mm Range Series 4792-150 Best Carbide carbide burrs areAluminium Door Relief Vent The Ductsure DG A 400200 is engineered for high airflow and durability, helping maintain ventilation and reduce condensation in door installations. Key Features: Part No: DG A 400200 Vent Facing Size (B B): 436 x 231 mm Internal Size (A A): 392 x 187 mm Configuration: Double sided design Max Hole Size for Hollow Doors (C C): 388 x 183 mm Max Hole Size for Solid Doors (D D): 430 x 225 mm Thicknesses: H1 = 36 mm, H2 = 37 mm