150 mm Diameter External Plastic Gravity Flaps with Spigot Intake Wall Extractor Fan Shutter Grille Damper Pressure Drop for Extractor Fan Ducting Exhaust

185 mm x 185 mm size, black Plastic Ducting Air Inlet / Air Outlet with Gravity Shutters - 6 inch / 150mm diameter round male spigot on the back of the grille. 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. Perfectly suited Bathroom or Kitchen extractor 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, air conditioning, HVAC, and Heat Recovery Systems. Suitable to use in compliance with Part F Building Regulations., Manufacturer: Fantronix