Grey 100mm 4 Inch Plastic External Ducting Gravity Grille Air Vent Cover Extractor Fan Back Draught Shutter Covers AC HVAC Bathroom Outside Wall Ventilation Hose Duct Grill - Part F Building Regs

✅ Suitable for 100mm, 4" ducting & extractor fan connections. Plastic duct air Inlet/outlet with Gravity shutters - 4 inch/ 100mm round male spigot at the back. Indoor or Outdoor use. Designed to terminate your extract duct to external walls. ✅ Suitable for whole house ventilation, passive ventilation, positive input, air conditioning AC, HVAC and heat recovery systems. Ideal for bathroom, kitchen, utility room & wet room extractor fans ✅ Suitable to use in compliance with part F building regulations. Finished in Grey. ✅ Temperature and UV-resistant antistatic plastic construction. Flush mounted fasteners. Easy maintenance. ✅ Non-return shutter gravity flaps close automatically without airflow. Stops odours, noises, draughts, wind, rain flowing back through your duct. Gravity flaps included - no clumsy springs., Manufacturer: Brite-R