These UV stable, screw in, trickle vents come in a complete set and have screw cap covers to hide screw heads. Available in three sizes: 2000, 3000 and 4000 to ensure each inhabited room has the correct amount of ventilation. The stocked colour options include White and Bright White, Anthracite, Black, Cream, Brown and Golden Oak. Drawings are available for each vent, click onto the vent details and select the required drawing or routing diagram from the datasheets section to access and download these. Some of the vents are shown in this short video. Please see the technical data sheet for each vent to see their performance regarding sound insulation, air permeability, watertightness and their EA rating, and remember that this will depend on the routing also.