Kair Louvred Grille Vent Cover with 110x54mm Rectangular Spigot Plastic ventilation grille for use with 110x54mm rectangular ducting. The female spigot on the back of the grille fits inside Kair male 110mm x 54mm Rectangular Duct Pipe Search for Part: DUCVKC249. Static Pressure Drop in Pascals: 15 l/s = 15.00 Pa - 30 l/s = 48.10 Pa - 60 l/s = 186.90 Pa. Free Air: 2600mm2. Max / Min Temperature: +60c / -15c. Built to last out of Polystyrene/Polypropylene Material. Suitable to use in compliance with Part F Building Regulations. This ducting outlet can be used as a part of a long ductwork run for a variety of purposes including whole-house ventilation, passive stack vent, air conditioning, HVAC, and Heat Recovery Systems. Perfectly suited for ducting your Bathroom, Toilet, or Kitchen extractor fan, Hydroponics, In-Line Extract Fans, or Cooker Hood.