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100MM WHITE PLASTIC GRAVITY WALL VENT GRILLE: Square external wall ventilation grille measuring 155 x 155mm, with a 100mm (4 inch) round male rear spigot; designed for compatible extractor fan ducting, ventilation pipes and indoor or outdoor wall installations NON-RETURN BACKDRAUGHT GRAVITY SHUTTERS: Built-in gravity-operated flaps open with outgoing airflow and close automatically when the extractor fan is not in use; the anti-draught shutter helps reduce cold air, unpleasant odours, outside noise and unwanted backdraughts entering through the ventilation duct EASY PUSH-FIT INSTALLATION WITH ROUND REAR SPIGOT: Designed for straightforward connection to compatible 100mm round ducting, air hoses and ventilation fittings; this 4 inch wall vent cover provides a convenient external air outlet for bathroom and kitchen extractor fan systems DURABLE WHITE PLASTIC VENT COVER: Manufactured from robust white plastic for domestic ventilation applications; the square gravity wall grille offers a neat exterior finish, while the integrated non-return shutter helps limit reverse airflow without requiring a spring mechanism VERSATILE EXTRACTOR FAN & VENTILATION APPLICATIONS: Suitable for compatible bathroom and kitchen extractor fans, cooker hood ducting, hydroponics fans, in-line extract fans and general household ventilation systems; a practical 100mm air outlet grille for residential ductwork and external wall ventilation