4-inch Push Fit PVC Gravity operated Bathroom Ventilation Extractor Fan Not Return Air Valve Back-draft Shutter Outlet Damper Grille 100mm Whole House Ventilation

Brown Plastic Ducting Air Inlet / Air Outlet with Gravity Shutters - 4 inch / 100mm round male spigot on the back of the grille for indoor or outdoor use. Non-return shutter flaps close automatically when not in use. Stops unpleasant odours, noises, or draughts flowing back through your duct. Gravity flap - no need for springs that could break. Easy to install, just push-fit duct and fittings together. Perfectly suited Bathroom or Kitchen extractor fan, Hydroponics fan or In-Line Extract Fan. This grille can be used as a part of a long ductwork run for a variety of purposes including whole house ventilation, passive ventilation, positive input, air conditioning, HVAC, and Heat Recovery Systems. Suitable to use in compliance with Part F Building Regulations., Manufacturer: Fantronix