The Passyfier Vent

Background Information

 Nowadays, everyone is more aware of the need to conserve energy.  The easiest way to conserve energy is to insulate properties to stop heat escaping.  Unfortunately, that also stops moisture vapour escaping, resulting in condensation on cold surfaces.  Subsequently the black spot mould resulting from condensation can lead to deterioration of internal decorations, soft furnishings, etc


What is a Passyfier Vent? 

The Passyfier vent is a through-the-wall telescopic sleeve containing a slab of mineral wool, with a louvered vent internally and an external cover available in various colours to match the external decor of the property. 
Passyfier Vents take advantage of the differential partial moisture vapour pressure that is normally higher inside an occupied building than on the outside during the condensation season.  The moisture vapour escapes by diffusion through the Passyfier Vent through the mineral wool whilst simultaneously preventing cold draughts.
This diffusion process is slow compared with mechanical ventilation and would not cope with a large amount of water vapour produced in a short time scale, ie in kitchens or bathrooms, without the use of mechanical ventilation.
Fitted mainly in habitable rooms, the Passyfier Vent will operate continuously, without noise, 24 hours per day extracting up to 2.3 litres of water per day and therefore preventing the build up of condensation.  All of this with little or no heat loss and because they are non-mechanical, once installed, they cost nothing to run.

We can supply and fit these units.