AirTech-UK Gravity Grille Brown 155mm External with 100mm - 4 inch Round Rear Spigot and Not-Return Shutters Ducting Air Vent

• Suitable for Vent ducting
• Surface-mounted
• Guarantee - 1 month

Features and benefits

• Brown Plastic Ducting Air Inlet / Air Outlet with Gravity Shutters. 150mm x 150mm external dimension with 4 inch / 100mm 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: 7200mm2. Static Pressure Drop in Pascals: 15 l/s = 10.94 Pa - 30 l/s = 18.59 Pa - 60 l/s = 24.21 Pa.