yes, it is called duct
put a slight slope in it, downwards towards the outside so that any condensation runs outward, and flop loft insulation over the duct to keep it warm.
I recommend the cowel outlets with a single anti-backdraught fap, not the ones like miniature venetion blinds that rattle annoyingly. You can get white, black or brown or paint to match with non-drip gloss.
http://www.screwfix.com/prods/14789/Heating-Cooling/Ducting/Manrose-Square-Brown-140mm-Cowl-Vent
put a slight slope in it, downwards towards the outside so that any condensation runs outward, and flop loft insulation over the duct to keep it warm.
I recommend the cowel outlets with a single anti-backdraught fap, not the ones like miniature venetion blinds that rattle annoyingly. You can get white, black or brown or paint to match with non-drip gloss.
http://www.screwfix.com/prods/14789/Heating-Cooling/Ducting/Manrose-Square-Brown-140mm-Cowl-Vent