The ‘Passyfier’ vent 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.

Key Features

- Transparent to water vapour

- No moving parts

- Works passively 24 hours a day

- Makes no noise

- Low installation cost

Benefits

- Reduces draughty air flow and heat loss

- No running costs

- Works at peak condensation times

- No night time disturbance from compressors or fans

Dimensions: To fit 230 mm x 155 mm aperture (i.e. standard 9” x 6” airbrick)

Main tube extended 340 mm, Main tube closed 240 mm, Main tube width 206 mm & Main tube height 136 mm

• New Technical Datasheets Available