546mm Large Defrost / Demister Vent for 63mm (2.5″) Air Ducting. The universal large defrost vents are made from injection moulded high strength ABS plastic and come complete with an insulating foam covering.& nbsp; The vents have internal directional flutes to evenly distribute the air along its length and the top flute is angled forward to direct the flow towards an upright style windscreen.& nbsp; These defrost vents are ideally suited to commercial bus transport and marine applications. <span id=”sceditor-end-marker” class=”sceditor-selection sceditor-ignore” style=”line-height: 0; display: none;”> </span><span id=”sceditor-start-marker” class=”sceditor-selection sceditor-ignore” style=”line-height: 0; display: none;”> </span>Please note that no fixing screws are supplied.<br>