100mm / 4" window vent duct

100mm ducting vent which screws into your windows vent - unscrew the standard vent and put this in it's place. Distance between screws=172mm (you could print an adapter plate for any screw distance) Round version - 100mm - no cap - can make one if you need.Oval version - 100mm - oval to fit under blinds. Also includes a plug cap to stop drafts. Boost MeThanks for the boost :)