A line of louvred plugs is offered for through hole ventilation applications. Designed for quick and easy installation, plugs can accomodate mounting hole diameters from 0.875" to 3.0" and panel thickness from 0.125" to 0.250". The plugs lock firmly into panels and withstand a push back force of 35 lbs. The standard color for these plugs is black, but they are available in other colors upon request.