Passyfier Core 140 High Rise Dehumidifier Vent

Health And Safety Considerations

Work from a safe, stable platform with adequate edge protection and good lighting. Wear safety goggles, a suitable dust mask, gloves and hearing protection when coring masonry. Isolate power to any nearby circuits before drilling and scan the wall to avoid cables, pipes and structural elements such as lintels.

Control dust using extraction and drill guards, keep the work area clear of trip hazards and prevent debris falling outside. Inform building management and neighbours before coring, and cordon off the drop zone at ground level. Use only a core drill with a working clutch, operated by a competent person, and follow the drill manufacturer’s handbook.

Do not install this product on buildings higher than six storeys above general ground level. If you are unsure about any task, engage a suitably qualified contractor.

Site Preparation

Choose the room that suffers from condensation and plan a high-level position on an external wall, ideally with the top of the internal grille about 300mm below the ceiling.

A high position is important because the warmest, moisture-laden air accumulates near the ceiling, so locating the vent here maximises vapour diffusion while keeping any perceived air movement away from occupant level.

Avoid siting behind curtains or large furniture and, in combined kitchen spaces, keep at least 1.5m from a cooker hood. Check wall thickness to confirm the supplied tube length of approximately 240mm to 350mm will suit.

Assemble tools and materials, including a Ø162mm Diamond Core Bit, a drill with clutch, dust extraction, a level, a saw suitable for trimming the duct if the wall is thinner than 350mm, a screwdriver for the internal grille fixings and the supplied plastic wedge to create the outward fall.

Limitations And Good Practice

This unit provides background humidity control for habitable rooms. It does not replace mechanical extraction in kitchens and bathrooms and it must never be used to supply combustion air for gas, oil or solid-fuel appliances.

Always install at high level where practicable. Maintain a slight fall to outside so any incidental moisture drains away from the interior. Keep the internal grille unobstructed, and in very exposed sites verify that the external cowl seats squarely and the rubber gasket is fully compressed to the outer face.

Performance reduces if fitted at low level, typically by around half, so only use a low-level position where absolutely unavoidable.

Step-By-Step Installation

1. Mark the position from inside the affected room, setting the intended centre so the finished grille will sit with its top about 300mm below the ceiling and clear of obstructions. Check for services and structural bearings, then mark a level line indicating a slight fall to the exterior.
   
   

2. Drill a small pilot hole on the centre mark through to the outside to establish the datum and confirm the wall build-up. Protect the area below the drilling point at ground level to guard against falling debris.
   
   

3. Core the main opening from inside using a Ø162mm Diamond Core Bit. Keep the drill level on the horizontal plane but follow the marked line so the hole has a slight outward fall. Withdraw the core carefully, remove loose debris and clean the opening.
   
   

4. Dry-fit the assembly by presenting the main duct and cowl to the hole. Ensure the red inner base label on the unit is oriented to the bottom of the duct when inserting, which sets the cowl correctly. If the wall is thinner than 350mm, trim the tube squarely to length so the internal flange will sit flush to the finished face.
   
   

5. Insert the cowl and duct from inside and push the unit fully home until the outer upstand of the rubber gasket is tight against the outer face of the wall. On very high rise properties a visual check with binoculars from the ground can help confirm the gasket has seated all round.
   
   

6. Create the mandatory outward fall by placing the supplied plastic wedge under the internal end of the tube so there is at least a 6mm drop to the exterior. Check the fall with a level and make sure the duct is not twisted.
   
   

7. Offer up the internal grille housing and fix it square to the wall using the supplied 19mm screws. Take care not to distort the housing. Clip the louvred grille with integral flyscreen into place.
   
   

8. Make good around the grille if required, clear debris and vacuum the area. Where mould has been present, wash the affected surfaces with a suitable fungicidal solution and allow to dry before redecorating.

Handover And Everyday Use

Explain to the occupants that the Passyfier Core 140 High Rise Vent works passively at all times and does not require switches or maintenance beyond light cleaning of the internal grille.

Advise them not to obstruct the grille with curtains, furniture or tape, and to continue using extract fans in kitchens and bathrooms to remove short-term moisture peaks.

Reassure them that the external cowl is designed for improved anti-draught performance and that the slight outward fall prevents water tracking indoors.

Maintenance And Aftercare

There are no moving parts. Periodically, for example every six to twelve months, wipe or lightly vacuum the internal grille and flyscreen to remove settled dust and cobwebs. From ground level, carry out an occasional visual check that the external cowl remains secure and clear of debris.

If signs of condensation return, review housekeeping first, such as using extract fans and maintaining steady background heat in colder weather. Re-clean any previously affected surfaces with a fungicidal wash before repainting to prevent latent spores from re-colonising.

Other Information

The Passyfier Core 140 High Rise Dehumidifier Vent is intended for rooms up to about 10m² per unit in typical domestic conditions.

The system can be installed in solid, cavity or timber frame walls and is supplied with a white internal grille with integrated flyscreen, a one-piece external cowl with matching rubber seal gasket, a telescopic duct, the plastic wedge for setting the fall and fixing screws.

The product must not be installed higher than six storeys above general ground level. It operates with zero running cost, makes no noise and contains no filters or motors. With correct siting at high level and a slight outward fall, it provides reliable, low-draught background moisture control that complements mechanical extraction and helps protect the building fabric.

Q) What is the Passyfier Core 140 High Rise Dehumidifier Vent and how does it reduce condensation in flats?

A) The Passyfier Core 140 High Rise Dehumidifier Vent is a passive, through-the-wall unit that continuously lowers background humidity in high-rise bedrooms, living rooms and dining spaces without using electricity. It relies on natural vapour diffusion, where the small pressure difference between warmer indoor air and cooler outdoor air encourages water vapour molecules to migrate outward through a short, smooth, large-diameter duct. An aerodynamic external cowl and a tight rubber perimeter seal limit bulk airflow, so felt draughts and heat loss are kept to a minimum while moisture still escapes. By trimming the average relative humidity day and night, the unit reduces window streaming, discourages black mould in cold corners and helps protect finishes and furnishings. Because there are no motors or flaps, it operates silently with zero running cost, and it complements, rather than replaces, extractor fans in kitchens and bathrooms that deal with short-term moisture peaks.

Q) Where should the Passyfier Core 140 High Rise Dehumidifier Vent be used and what room size does a single unit serve?

A) Use the Passyfier Core 140 High Rise Dehumidifier Vent in the specific rooms that show persistent condensation, typically bedrooms and small living areas in multi-storey buildings. One unit is recommended for spaces up to 10m² in normal domestic conditions and can transmit up to 1.4L of moisture vapour per 24 hours. If you have a larger open-plan area, consider two units on opposing external walls so distribution remains even. The kit is suitable for solid walls, cavity walls and timber-frame constructions when the wall is cored correctly and the rubber gasket is seated tightly to the façade. Best results come from combining the vent with good practice, such as using bathroom and kitchen extract fans during moisture-producing activities and maintaining steady background heating in colder months, which together keep indoor humidity within a healthier band for both occupants and the building fabric.

Q) How is the Passyfier Core 140 High Rise Dehumidifier Vent different from standard through-wall models?

A) The Passyfier Core 140 High Rise Dehumidifier Vent is designed specifically for inside-fit installation in tall buildings, so most flats do not require scaffolding or external fixings. Its main duct, rubber seal gasket and external anti-draught cowl form a single push-through assembly that is inserted from indoors after core drilling, then seated tight to the façade to create an airtight, weather-resistant seal. The tube adjusts between 240mm and 350mm to suit typical wall thicknesses and a supplied plastic wedge sets a slight outward fall so incidental moisture drains safely outside. The cowl shape improves wind behaviour on exposed elevations, which helps preserve moisture diffusion while limiting felt air movement at occupant level. In practice, this inside-only method shortens programme time, reduces disruption to residents, and delivers a neat exterior finish that blends with the façade via colour-matched cowls.

Q) Does the Passyfier Core 140 High Rise Dehumidifier Vent need electricity and how quiet is it in use?

A) The Passyfier Core 140 High Rise Dehumidifier Vent is entirely passive, so it requires no electricity, has no controls to set and contains no moving parts that could wear or generate noise. The mechanism is diffusion rather than forced ventilation, which means the unit works silently around the clock without humming or vibration. An aerodynamic external cowl moderates wind pressures at the wall opening to reduce whistling and back-draft risk, and the internal louvred grille with flyscreen keeps insects and debris out without restricting diffusion. Because bulk airflow is intentionally moderated, occupants should not feel the chilling currents associated with open grilles. The result is dependable, background moisture control that is unobtrusive in bedrooms and living rooms and continues working exactly when condensation risk is highest, typically overnight and early morning as temperatures fall.

Q) What are the key technical specifications for the Passyfier Core 140 High Rise Dehumidifier Vent?

A) The Passyfier Core 140 High Rise Dehumidifier Vent serves rooms up to 10m² per unit and can transmit up to 1.4L of moisture vapour per 24 hours under typical domestic conditions. Installation requires a Ø162mm core-drilled opening, receiving an outer tube of approximately 154mm diameter with a telescopic reach from 240mm to 350mm to suit common wall thicknesses. The assembly includes a colour-matched external anti-draught cowl with a rubber seal gasket for a weather-tight, airtight interface, and a white internal louvred grille with integrated flyscreen measuring about 200mm × 200mm × 30mm for a clean interior finish. The unit operates passively and silently with zero running cost, and it is compatible with solid, cavity and timber-frame walls when cored correctly. An outward fall is required to drain any incidental moisture and is set using the supplied plastic wedge during installation.

Q) Where is the best position for the Passyfier Core 140 High Rise Dehumidifier Vent and why is height so important?

A) Site the Passyfier Core 140 High Rise Dehumidifier Vent high on an external wall in the room that suffers from condensation, ideally with the top of the internal grille about 300mm below the ceiling. Warm indoor air accumulates near the ceiling and can carry higher moisture content, so locating the diffusion path at high level increases the driving difference and improves effectiveness. A high position also keeps any slight air movement away from occupant level, which helps comfort and reduces the temptation to block the grille. Avoid siting behind curtains, pelmets or tall furniture that could mask the opening. In combined living spaces, a diagonal position relative to a kitchen extract can improve overall air movement. If low-level fitting is unavoidable, expect reduced perceived performance compared with a high-level position, which is why the manufacturer recommends high-level placement wherever practical.

Q) How much moisture can the Passyfier Core 140 High Rise Dehumidifier Vent remove and what results should I expect?

A) In normal domestic conditions the Passyfier Core 140 High Rise Dehumidifier Vent can transmit up to 1.4L of water vapour per day while serving rooms up to 10m². The effect is not an instant purge but a steady reduction in background relative humidity, which in turn lowers the frequency and severity of surface condensation on glazing and cold bridges. Over time decorations dry more readily, mould growth is discouraged and soft furnishings and window reveals remain in better condition. The gentler, always-on action is most effective in airtight, well-insulated flats where humidity can otherwise become trapped. As with any ventilation measure, outcomes depend on occupant habits and the performance of separate kitchen and bathroom extract, so pair the vent with sensible housekeeping and routine use of extractor fans for best results.

Q) Will the Passyfier Core 140 High Rise Dehumidifier Vent cause draughts or increase heat loss on exposed façades?

A) The vent is engineered to allow moisture molecules to diffuse out while moderating bulk airflow, which is the main carrier of heat and the main cause of perceived draught. The external anti-draught cowl regulates wind behaviour at the wall opening, reducing the chance of wind-driven blasts or reverse flow and helping keep rooms comfortable. The push-through rubber gasket creates a tight seal to the façade, so there are no peripheral gaps that could whistle or leak. In practice, occupants report a calmer, more stable background ventilation effect than with simple grilles or gravity flaps, particularly on windy elevations. Because bulk airflow is minimised relative to permanently open vents, heat loss is modest while moisture diffusion continues, which strikes a practical balance between comfort, energy awareness and condensation control.

Q) What are the main limitations of the Passyfier Core 140 High Rise Dehumidifier Vent and what should it not be used for?

A) The high-rise model must not be installed higher than six storeys above general ground level. It is intended for background humidity control in habitable rooms and does not replace compliant mechanical extraction in kitchens and bathrooms, which are necessary for rapid removal of short-term moisture peaks. Do not use the unit to supply combustion air for gas, oil or solid-fuel appliances, always follow the appliance manufacturer’s ventilation requirements and relevant regulations. Performance is reduced at low-level positions because warm, moisture-laden air pools near the ceiling, so install high wherever possible. As with any through-wall work, avoid structural elements such as lintels and damp-proof courses and survey for hidden services before drilling. Where rooms are larger than 10m² or moisture loads are unusually high, specify additional provision to maintain control.

Q) What is supplied with the Passyfier Core 140 High Rise Dehumidifier Vent and are there colour options for the exterior?

A) The kit includes the main duct pre-assembled with a colour-matched external anti-draught cowl and a rubber seal gasket, a white internal louvred grille with integrated flyscreen, a plastic wedge used to set the required outward fall, appropriate fixings and printed installation instructions. The external cowl is available in a range of finishes so the installation can blend with common brick, render and cladding schemes across housing estates and mixed-tenure blocks. The internal grille provides a neat, easily cleanable finish that suits bedrooms and living areas, and its simple clip-in design allows quick removal for periodic dusting. All components are designed to work together as a complete inside-fit solution, which simplifies stockholding for maintenance teams and speeds up installation during occupied refurbishments with minimal disruption to residents.

Q) How is the Passyfier Core 140 High Rise Dehumidifier Vent installed from the inside and what tools are required?

A) A competent installer cores a Ø162mm circular opening from the room side using a core drill with a functioning clutch and suitable dust extraction. After cleaning the opening, the main pre-assembled duct, gasket and cowl are pushed through from indoors until the cowl seats and the rubber seal compresses evenly to the outer wall face. The tube length is adjusted between 240mm and 350mm to suit the wall thickness, trimming squarely if the wall is thinner than the supplied range. The plastic wedge is placed to create a minimum 6mm outward fall so any incidental moisture drains outside. Finally, the internal grille housing is fixed square to the wall and the louvred grille with flyscreen is clipped into place. Basic tools include a Ø162mm Diamond Core Bit, a drill with clutch, dust control, a level, a fine saw for trimming the tube if needed and a screwdriver for the grille fixings.

Q) What routine maintenance does the Passyfier Core 140 High Rise Dehumidifier Vent require and what aftercare helps long-term results?

A) Maintenance is minimal because there are no moving parts or filters. Once or twice a year, lightly vacuum or wipe the internal louvred grille and flyscreen to remove dust and cobwebs and check that the opening is unobstructed by curtains or furniture. From ground level, carry out an occasional visual check that the external cowl remains secure and clear of debris and that the push-through gasket still appears tight to the façade. If the room previously suffered from mould, wash affected surfaces with a suitable fungicidal cleaner and allow them to dry before repainting with an appropriate coating. Maintain steady background heating in colder weather and continue to use kitchen and bathroom extract fans during moisture-producing activities. In larger spaces, a second unit on the opposite wall can improve distribution and keep results consistent across the floor area.

Q) What installation tips improve the real-world performance of the Passyfier Core 140 High Rise Dehumidifier Vent?

A) Choose the actual problem room, not simply a convenient wall, then set a high-level position with the top of the grille about 300mm below the ceiling and clear of curtains, pelmets and tall furniture. Core the hole with a slight downward angle to the exterior, clean the opening thoroughly and use the supplied plastic wedge to preserve a minimum 6mm outward fall through the wall. Push the one-piece assembly fully home so the rubber gasket seats evenly to the façade all round, then fix the internal grille square and flush. Confirm free passage by holding a light tissue near the grille to feel a gentle moderation of airflow rather than a cold stream. Keep the grille visible for easy housekeeping and pair the vent with good practice such as prompt use of bathroom and kitchen extract fans and maintaining door undercuts so air can circulate gently towards the vent.

Q) How does the Passyfier Core 140 High Rise Dehumidifier Vent compare with the Passyfier Core 100 High Rise model?

A) Both High Rise variants install entirely from inside and use the same passive diffusion principle with an external anti-draught cowl and a push-through rubber gasket. The Passyfier Core 140 High Rise is larger and serves rooms up to 10m² with a maximum moisture transmission of about 1.4L per 24 hours, using a Ø162mm core hole and a 154mm outer tube. The Passyfier Core 100 High Rise is sized for smaller rooms up to 7m² with up to 1L per 24 hours and uses a Ø142mm core hole with a smaller tube. Selection is therefore guided by room size, required moisture capacity and the existing or planned core size. In both cases, installation is from the room side, a slight outward fall is required, and the products complement kitchen and bathroom extract rather than replacing those fans, providing quiet background control in bedrooms and living areas of multi-storey buildings.

Technical Data Sheet

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