Blauberg Brown Gravity Grille 100mm - 4 inch External Ducting Air Vent with Round Spigot and Non-Return Gravity Shutters Ceiling Ventilation Grill Extractor Fan Cover for Cooker Hood Venting

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. Designed to terminate your extract duct to an external wall. 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. Gravity operated flaps that close when Not in use. 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.