Kair White Gravity Grille 155mm External Dimension Ducting Air Vent with 125mm - 5 inch Round Rear Spigot and Not-Return Shutters

White Plastic Ducting Air Inlet / Air Outlet with Gravity Shutters. 155mm x 155mm external dimension with 5 inch / 125mm round male rear 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. Airflow performance independently tested by BSRIA or BRE. Free Air: 11,600mm2. Static Pressure Drop in Pascals: 15 l/s = 6.43 Pa - 30 l/s = 9.91 Pa - 60 l/s = 11.25 Pa., Weight: 0.18 pounds, Manufacturer: Kair