Does anyone know if there is such a thing as fast-fix ducting kit in 150mm/6"? i.e. the ones that you can just do by pushing through from inside the property and then pulling back to form a seal on the external wall (i know you can get them for extractor fans at 100mm). Kitchen is on 3rd floor flat so can't get to outside without scaffolding in order to fit a grill/cowl. Cheers
proberbly a late reply I once had same problem using string with a weight on push through duct to ground level connect the vent sealant to perimeter and pulling back up should be the answer????