Passyfier 230 Extension Sleeve

Q) What is the Passyfier 230 Vent Extension Sleeve and what does it do?

A) The Passyfier 230 Vent Extension Sleeve is a purpose made add on that increases the through the wall reach of a Passyfier Sleeved 230 Dehumidifier Vent when the wall is deeper than standard. The core Passyfier 230 kit covers up to about 340mm of wall thickness. Each Passyfier 230 Vent Extension Sleeve adds a further 112mm, so one sleeve takes the reach to roughly 450mm, two sleeves to about 560mm, and three sleeves to around 670mm. The extension connects in line with the existing telescopic sleeve to create a single continuous duct from room side to outside. This continuity is important because it preserves the warm sleeve principle that supports passive vapour diffusion while resisting bulk airflow, which in turn limits felt draughts and heat loss. The product sits within the wall build so the interior grille and external cover remain exactly as intended for a neat finish. In short, the extension sleeve lets you install the Passyfier 230 correctly in thicker walls without improvisation, while keeping the dehumidifier vent’s moisture control performance and appearance exactly as designed.

Q) When should I use the Passyfier 230 Vent Extension Sleeve and is it compatible with my construction?

A) Use the Passyfier 230 Vent Extension Sleeve whenever a measured wall thickness exceeds the standard reach of the Passyfier Sleeved 230 Kit. Typical triggers include deep solid stone or brick walls, cavity walls with wide cavities or added insulation, and timber frame or cladded build ups that include service zones and sheathing layers. The sleeve is engineered specifically for the Passyfier Sleeved 230 Dehumidifier Vent, so the cross section and airflow geometry remain unchanged and the condensation control performance is retained. You can fit one sleeve to extend to about 450mm, two sleeves to about 560mm, or three sleeves to around 670mm. The extension is suitable for solid masonry, cavity wall and timber frame construction, provided normal good practice is followed, which includes setting a slight outward fall and sealing where the duct crosses an open cavity so air cannot bypass the diffusion path. Because the extension sits within the wall, the visible components remain the standard internal louvre and external cover, giving a consistent look across a project even where wall depths vary from one elevation to another.

Q) How do I install the Passyfier 230 Vent Extension Sleeve and what practical tips ensure best results?

A) Installation of the Passyfier 230 Vent Extension Sleeve follows the same method as the core Passyfier Sleeved 230 kit. Measure wall thickness at several points to account for plaster, parging and uneven masonry, then dry fit the telescopic sleeve and extension together to confirm reach before any bedding. Join the Passyfier 230 Vent Extension Sleeve in line with the main duct so the internal surface is continuous, then set the assembled sleeve to a slight outward fall so any incidental moisture drains safely to the exterior. If the duct crosses an open cavity, form a continuous internal mastic seal around the penetration on the room side to prevent bypass draughts and to preserve the warm sleeve principle. Keep the joint square and untwisted so the internal grille and external cover sit flush and level when fixed. Avoid over tightening fixings that could distort the duct, and make good carefully so there are no gaps around the sleeve that would allow uncontrolled air paths. A simple check with a level and a second look along the bore of the duct before final fixing helps confirm alignment, fall and joint integrity for reliable long term performance.

Q) What are the key technical details and limitations of the Passyfier 230 Vent Extension Sleeve that I should know before ordering?

A) The Passyfier 230 Vent Extension Sleeve is a factory matched component for the Passyfier Sleeved 230 Dehumidifier Vent. Each sleeve adds 112mm of additional wall thickness capacity beyond the kit’s standard reach of about 340mm. In practical terms, one sleeve takes you to roughly 450mm, two sleeves to about 560mm and three sleeves to around 670mm. The extension maintains the same internal cross section as the base sleeve so effective area and passive vapour diffusion are preserved. The product is intended to extend reach only, not to alter airflow or to supply combustion air, and it should not be combined with third party tubes, reducers or improvised couplers that could introduce steps, turbulence or thermal bridging. Always set a slight outward fall on the assembled sleeve, seal neatly at cavity interfaces, and ensure the external face is weathered correctly with the standard cover. If wall thickness exceeds the reach achievable with three extensions, seek project specific advice rather than stacking further parts. As with any through the wall work, confirm the route is clear of services and structural elements, and follow the Passyfier 230 installation guidance so the warm sleeve principle and discreet appearance are both retained.