Passifier Vent

A through-the-wall, ‘warm’ telescopic sleeve with a slab of mineral wool inside, louvered vent internally and an appropriate external cover. The mineral wool is transparent to the exodus of moisture vapour while simultaneously preventing cold draughts so that people do not block them up with old newspapers or stick posters over them. They can easily be retrofitted in response to condensation call-outs, during refurbishment programmes or installed directly in new build.