Vents 4 inch Black External Gravity Grille Air Vent Cover 100 mm Extractor Fan Back Draught Shutter Covers Ducting Tumble Dryer Bathroom Outside Wall Ventilation Hose Duct Grill

Fits standard 100mm ducting – Gravity grille with 100mm (4”) rear spigot; overall external size 155 × 155 mm for a neat wall or ceiling finish. Non-return shutters – Three gravity flaps open with airflow and close when the fan is off, helping block draughts, rain, noise, odours, insects, and debris. Push-fit installation – Simple push-fit connection to 100mm ducting; can be sealed with mastic, cement, or tape if required for a secure finish. Wide ventilation compatibility – Suitable for bathroom and kitchen extractor fans, whole-house ventilation, HVAC, passive airflow, and heat recovery systems. Building Regulations compliant – Manufactured in line with Approved Document F, supporting compliant domestic ventilation installations., Manufacturer: VENTS UK