Passyfier® Vent 140

Passyfier® Vent 140

Passyfier® | Condensation Control


The Passyfier® Vent 140 provides an opening on a section of wall normal to the airflow direction with an effective area well in excess of the minimum requirement. Airflow through the opening is controlled automatically by the intervening mineral wool slab and thereby avoids undue draughts.

It is important to realise that the release of moisture vapour pressure within a dwelling to avoid condensation does not require a specific ventilation rate.

The moisture vapour pressure within a dwelling is always higher than the outside pressure therefore there will always be an escape of moisture vapour by the diffusion process through the Passyfier® Vent.

The diffusion process is slow compared with mechanical ventilation and would not cope with the copious amount of water vapour produced in a short time scale without the combined use of mechanical ventilation in kitchens and bathrooms.

Its main use is in habitable rooms where it operates continuously without noise and over a 24 hour period can extract a maximum of 1.4 litres of water/day even at low vapour pressures.

The Passyfier® 140 Core Dehimidifier requires a 162mm Core Bit for application.


It is easier to fit the Passyfier® 140 Core Vent in existing clinker/concrete walls.

However, it will be necessary to install two Passyfier® 140 Core Vents to achieve almost the same (albeit slightly more) water vapour transmission as one Passyfier® 230 Sleeved Wall Vent.

Note: Passyfier® Vents are used as an aid to help control humidity and are NOT to be used as a method of providing ventilation to any gas, oil, or solid fuel appliance.

Technical Data
  • Maximum Water Vapour Transmission: 1.4 litre per 24 hours

  • Maximum Floor Area Per Vent Kit: 10

  • Main Tube Length (Open): 410mm

  • Main Tube Length (Closed): 260mm

  • Main Outer Tube Diameter: 152mm (6")

  • Core Bit Drill Size: Use 162mm Diameter Core

  • White Internal Grille with Built-In Fly Screen.

Data Sheets

Technical Data Sheet

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£69.00 ex. VAT | £82.80 inc. VAT

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