Airflow 100mm Brown External Air Vent Cover Gravity Grille – 154x154mm Square Wall Cover with Round Rear Spigot & Backdraught Shutter Flaps for Extractor Fans & Bathrooms

• Perfect Fit for 100mm Ducting – Airflow gravity vent grille features a 100mm (4 inch) round rear spigot and 154x154mm square external wall cover plate, providing a clean and professional finish on any interior or exterior wall surface.
• Automatic Backdraught Shutter Flaps – Gravity-operated flaps open with airflow and close automatically when the extractor fan is off, preventing cold draughts, rain ingress, insects, unpleasant odours, and noise from entering through the duct — no springs to wear out or break.
• Quick & Easy Push-Fit Installation – Simply push-fit onto standard 100mm ducting for a fast, hassle-free install. Can be sealed with mastic, silicone, or waterproof tape for a secure weatherproof finish suitable for indoor and outdoor use.
• Versatile Ventilation Compatibility – Ideal for bathroom extractor fans, kitchen extractor fans, utility rooms, tumble dryers, hydroponics fans, inline extract fans, whole house ventilation, HVAC, heat recovery systems (MVHR), positive input ventilation (PIV), and passive airflow systems.
• Building Regulations Compliant – Manufactured in accordance with Approved Document F, ensuring compliant domestic ventilation installations. Made from durable UV-resistant plastic for long-lasting indoor and outdoor performance.

The Airflow External Gravity Vent Grille is a premium quality outside wall vent cover designed for reliable, low-maintenance ventilation in residential and commercial properties. Built with a square front cover plate and a round rear spigot, this grille offers a neat, professional finish on any exterior or interior wall surface. Featuring gravity-operated backdraught shutter flaps, the grille opens automatically when your extractor fan is running and closes shut the moment it stops — effectively blocking cold draughts, rain, insects, odours, and external noise from entering your home through the ductwork. Unlike spring-loaded alternatives, the gravity flap mechanism requires no maintenance and has no moving parts that can wear out or break over time. Installation is quick and straightforward. The round rear spigot push-fits directly onto standard ducting and can be further secured with mastic, silicone sealant, or waterproof tape for a fully weatherproof finish. Suitable for both indoor and outdoor use, this vent grille is compatible with a wide range of ventilation systems including bathroom and kitchen extractor fans, tumble dryer outlets, inline extract fans, whole house ventilation, MVHR heat recovery systems, positive input ventilation (PIV), HVAC, and passive airflow systems. Manufactured from durable UV-resistant plastic and compliant with Approved Document F of the Building Regulations, the Airflow gravity vent grille is built to last and designed to meet the ventilation standards required for modern domestic installations. Available in a range of sizes and colours to suit any property style.