Passyfier Core 100 High Rise Dehumidifier Vent

Health & Safety Considerations

Work from a safe, stable platform with good lighting. Wear safety goggles, a dust mask, gloves and suitable clothing. When core drilling, use dust extraction where possible and control slurry or debris. Isolate nearby electrics before cutting and use a cable and pipe detector to avoid concealed services. Keep the work area clear and ventilated. This model is designed to be installed from inside, reducing the need for external access, but take care when working near open windows on upper floors. If you are not confident with core drilling or through-wall work, a competent tradesperson should carry out the installation.

Site Preparation

Install the vent in the room that actually suffers from condensation, typically the cold corner of a bedroom or living space. Position it high on an external wall so the top of the internal grille sits no more than about 300 mm below the ceiling. This height matters because the warmest, most moisture-laden air collects near the ceiling, so a high-level vent captures vapour effectively while keeping perceived draughts at occupant level to a minimum. Keep the grille clear of curtains, pelmets and tall furniture. In open-plan areas, siting the vent diagonally opposite any kitchen extract helps overall air movement, and keep at least 1.5 m away from a cooker hood. Confirm that the wall thickness is within the product range of roughly 240mm–350mm. The kit’s main duct, rubber gasket and external cowl are a single component that is pushed through from inside after coring. A plastic wedge is supplied to create a slight outward fall through the wall; have it to hand alongside a Ø142mm core bit, drill with a slipping clutch, dust control, a spirit level and the supplied fixings.

Limitations And Good Practice

This vent provides passive background moisture control in habitable rooms and does not replace rapid mechanical extraction in kitchens or bathrooms. Do not use it to provide combustion air for gas, oil or solid-fuel appliances. The High Rise version must not be installed higher than six storeys above general ground level. Always set the duct to fall slightly to the outside so that incidental moisture drains out, and make sure the external rubber gasket seats tightly against the outer face of the wall. Mount at high level wherever practical because low-level positions can reduce perceived performance.

Step-By-Step Installation

1. Mark the position on the internal face of the chosen external wall. Aim for a high-level location with the top of the grille about 300 mm below the ceiling and well clear of curtains or cupboards. Check the area for services with a detector.
   
   

2. Set up the core drill with a Ø142mm Core Bit. From indoors, drill the hole square to the wall but with a very slight downward angle to the exterior, creating at least a 6 mm fall. Use dust extraction and proceed steadily as you approach the external leaf to minimise breakout.
   
   

3. Clean the core hole thoroughly. Trial the plastic wedge in the lower quadrant of the hole so that it will support the duct and preserve the outward fall during fixing.
   
   

4. Prepare the combined duct, gasket and external cowl sub-assembly. Ensure the red inner base label (where present) will sit at the bottom of the duct when inserted so that any incidental moisture drains outward.
   
   

5. Dry-fit the assembly through the cored opening from inside. Check that the outer upstand of the rubber gasket sits tight to the external wall all the way around. On very high properties it can help to verify this seal visually from the ground with binoculars.
   
   

6. Assess the duct length. If the wall is thinner than the factory length, trim the outer tube carefully so the inner face finishes flush with the internal surface while maintaining the outward fall. The usable range is roughly 240–350mm; do not install below the minimum wall thickness.
   
   

7. With the duct correctly sized, push the assembly home so the gasket compresses firmly to the external wall. Use the plastic wedge to maintain the outward fall and to stop the duct settling level during fixing.
   
   

8. Separate the internal grille from its housing by gently deflecting the top wall of the grille towards the centre with a flat blade at the point indicated. Offer the housing to the wall, level it, and secure it using the supplied 19mm screws and plugs. Take care not to distort the housing.
   
   

9. Clip the louvred grille with integral flyscreen back into its housing so it sits flush and even. Wipe away dust and ensure the opening is unobstructed.
   
   

10. Make good the edges if required, then clean down. The vent is now operational and will begin passively diffusing moisture out of the room.

Handover And Everyday Use

Explain to the user that the vent is entirely passive and has no controls or running costs. It works continuously by allowing moisture vapour to migrate outdoors while limiting airflow to avoid uncomfortable draughts.

Ask occupants not to cover the grille with curtains or furniture and to continue using bathroom and kitchen extract fans to remove short-term humidity peaks.

Maintenance

There are no moving parts. Once or twice a year, lightly vacuum or wipe the internal grille and flyscreen to remove dust and cobwebs.

From indoors, check that the gasketed external cowl remains tight to the outer wall and that the duct still has a slight outward fall. If the property is very exposed, a quick visual check after storms is sensible.

Aftercare

Where rooms previously had black mould, wash affected surfaces with a suitable fungicidal cleaner and allow them to dry fully before redecorating, ideally with a mould-resistant paint.

Maintain steady background heating in colder weather and keep internal doors undercut so air can circulate towards the vent. In larger open-plan rooms, consider a second vent on the opposite wall for more even control.

Other Information

The Passyfier Core 100 High Rise is designed for bedrooms, living rooms and dining rooms in multi-storey buildings and is installed completely from the inside.

Maximum served floor area per vent is around 7m² and maximum water vapour transmission is approximately 1 litre per day under typical domestic conditions.

The internal grille measures roughly 200mm x 200mm x 30mm and includes a built-in flyscreen.

The system costs nothing to run, makes no noise and continues working at peak condensation times, typically overnight and early morning.

Q) What is the Passyfier Core 100 High Rise Dehumidifier Vent and how does it control condensation in flats?

A) The Passyfier Core 100 High Rise Dehumidifier Vent is a passive through the wall unit that continuously lowers background humidity in high rise bedrooms, living rooms and dining rooms without using power. It relies on natural vapour diffusion, the small pressure difference between warmer indoor air and cooler outdoor air encourages water vapour molecules to migrate outward through the vent while the internal pathway limits bulk airflow. By steadily trimming the room’s average relative humidity, it reduces window streaming at dawn, discourages black mould on cold corners and helps protect decorations and furnishings. Because there are no motors, sensors or flaps, operation is silent and there are no running costs. A shaped external cowl moderates wind so occupants feel minimal draughts, while an internal white louvred grille with an integrated fly screen keeps the finish tidy and easy to clean. One unit is intended for compact rooms and works best when combined with normal extractor fans in kitchens and bathrooms for short moisture peaks.

Q) Where should the Passyfier Core 100 High Rise Dehumidifier Vent be used and what room size does a single unit serve?

A) The Passyfier Core 100 High Rise Dehumidifier Vent is purpose sized for smaller habitable rooms in multi storey buildings that suffer persistent background condensation, typical examples are bedrooms, nurseries, study rooms and compact living spaces in flats. In normal domestic conditions a single unit serves up to 7m² of floor area and can transmit up to 1L of water vapour per 24 hours, helping to stabilise humidity between daily moisture events. If an open plan zone is larger than 7m², fit an additional device or consider complementary measures so distribution remains even. The vent is suitable for solid walls, cavity walls and timber frame constructions when correctly sealed to the façade, and the high rise format is specifically intended for sites where external access is difficult. Best results are achieved in the rooms that actually show condensation, rather than installing generically, and performance improves further when occupants continue to use mechanical extract fans in kitchens and bathrooms during cooking and showering. 

Q) How does the Passyfier Core 100 High Rise Dehumidifier Vent differ from standard through wall models?

A) The high rise variant is engineered for installation entirely from inside the dwelling, which avoids scaffolding and external fixings on most blocks. Its one piece assembly combines the main duct, a compressible rubber sealing gasket and the external anti draught cowl so the installer can push the unit through the core drilled opening from the room side until the cowl seats to the façade and the gasket forms a weather resistant seal. A supplied plastic wedge is used to set a slight outward fall through the wall so any incidental moisture drains safely outside, and a telescopic tube adjustment of about 240–350mm accommodates common wall thicknesses. The external cowl profile has been refined for exposed elevations typical of towers and mid rise buildings, limiting felt air movement indoors while preserving vapour transmission. These details shorten programme time, reduce disruption to residents and simplify access arrangements for social housing, student accommodation and private apartment blocks.

Q) Does the Passyfier Core 100 High Rise Dehumidifier Vent need electricity and is it quiet in use?

A) The Passyfier Core 100 High Rise Dehumidifier Vent is entirely passive, it has no power supply, no motor and no moving parts, so it operates at zero running cost and with no fan noise. The moisture control mechanism is molecular diffusion, not forced airflow, which means the unit works continuously day and night without switches or settings. Because bulk airflow is intentionally moderated, occupants should not experience the chilling currents often associated with open grilles. The external cowl is shaped to temper wind pressure at the façade, which helps avoid whistling and reduces the likelihood of reverse flow in gusty conditions. The result is a background humidity control device that runs silently in bedrooms and living rooms and remains effective at peak condensation times, typically overnight and early morning as temperatures fall. For short intense moisture peaks from cooking or showering, continue to rely on mechanical extract fans, the two strategies complement each other rather than compete.

Q) How is the Passyfier Core 100 High Rise Dehumidifier Vent installed from inside and what tools are required?

A) Installation is straightforward for competent trades and is carried out entirely from the room side. Using a Ø142mm Core Bit, drill a neat circular opening through the external wall on a slight downward angle to the outside to create an outward fall of at least a few millimetres, then clean the hole thoroughly. Dry fit the one piece assembly so that the external anti draught cowl and rubber gasket push through and seat evenly to the façade, adjust the telescopic tube between about 240–350mm to suit wall thickness and use the supplied plastic wedge to preserve the outward fall while fixing. If the wall is thinner than the factory length, trim the outer tube carefully so the internal end sits flush to the room face. Fit the internal white louvred grille with integrated fly screen to complete the finish, then make good as required. Typical kit contents include the push through duct and cowl, the compressible gasket, the internal grille, the wedge and printed instructions.

Q) What is the best position for the Passyfier Core 100 High Rise Dehumidifier Vent and why is height important?

A) For maximum effect site the vent high on the external wall of the room that actually suffers from condensation, with the top of the internal grille set no more than about 300mm below the ceiling. Warm indoor air accumulates near the ceiling and carries a higher concentration of water vapour, so placing the diffusion path at high level improves the driving difference and reduces perceived air movement at occupant level. Keep clear of curtains, pelmets, tall wardrobes and wall units that could mask the grille, and choose the colder corner furthest from the doorway where stale air often lingers. In open plan spaces position the unit so that general air movement can guide humidity towards the vent between kitchen or bathroom moisture events, diagonal placement relative to an extract fan is often helpful. Always create a slight outward fall through the wall so any incidental moisture drains externally and consider a second unit for larger zones to maintain even control across the floorplate.

Q) How much moisture can the Passyfier Core 100 High Rise Dehumidifier Vent transmit and what results should I expect?

A) In typical domestic conditions the Passyfier Core 100 High Rise Dehumidifier Vent can transmit up to 1L of water vapour per 24 hours while serving rooms up to 7m². The effect is a steady reduction in the room’s background relative humidity, which cuts the frequency and severity of surface condensation on glazing, external corners and other cold bridges. Over days and weeks decorations dry more readily, black mould is discouraged and soft furnishings and window reveals remain in better condition. Because the device works continuously rather than in bursts, it provides a gentle, always on buffer that complements mechanical extract, not a rapid purge. Expect the largest gains in airtight, well insulated flats where humidity has been trapped by improved fabric and glazing. As with any ventilation measure, results depend on occupant habits, heating patterns and the performance of separate kitchen and bathroom extract, so pair the vent with sensible housekeeping for best outcomes.

Q) Will the Passyfier Core 100 High Rise Dehumidifier Vent create draughts or increase heat loss on exposed façades?

A) The design purposefully limits bulk airflow while allowing water vapour to diffuse outward, which keeps felt draughts very low compared with open vents. The external anti draught cowl improves pressure behaviour in wind by conditioning the airstream across the wall opening, reducing the chance of reverse flow and the cold blasts that cause occupants to block grilles. Because heat is mainly carried by air movement rather than by the diffusion of moisture molecules, moderating bulk airflow helps control heat loss relative to permanently open apertures. The inside only installation seats a compressible rubber gasket tight to the façade for a weather resistant seal, avoiding gaps that could whistle or leak. In practice occupants report quieter, more stable ventilation in windy conditions versus simple cowls or gravity flaps, especially on taller elevations. The vent’s action is background dehumidification, not rapid air change, so comfort is maintained while humidity is gently controlled.

Q) What are the key technical specifications of the Passyfier Core 100 High Rise Dehumidifier Vent?

A) The unit is a passive vapour diffusion pathway with a shaped external cowl and an internal white louvred grille with integrated fly screen. It serves up to 7m² of floor area and transmits up to 1L of moisture vapour per day under normal domestic conditions. Installation uses a Ø142mm Core drilled opening from inside, the main outer tube is about 128mm in diameter and the telescopic adjustment spans roughly 240–350mm to suit wall thickness, a supplied plastic wedge is used to set a slight outward fall. The push through assembly incorporates a compressible rubber gasket that forms an airtight and weather resistant seal to the external face when the cowl is seated. The product is silent in operation, has zero running cost and is compatible with solid walls, cavity walls and timber frame constructions when correctly sealed. A nominal 200mm by 200mm by 30mm internal grille completes the room side finish and is removable for light cleaning.

Q) What limitations apply to the Passyfier Core 100 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, this limitation reflects practical considerations of wind exposure, access arrangements and product scope. It is a background dehumidification device for habitable rooms and does not replace rapid mechanical extraction at moisture sources, kitchens and bathrooms still require compliant fans for short term peaks. The vent must not be used to supply combustion air for gas, oil or solid fuel appliances, always follow appliance manufacturers’ ventilation instructions and relevant regulations. As with any through wall work, do not install where the core route would compromise a lintel or damp proof course and always check for concealed services before drilling. Low level siting reduces perceived performance because warm moisture laden air pools at the ceiling, so prioritise a high level position. For rooms larger than the stated capacity or for severe moisture loads, specify additional provision to maintain control.

Q) How do I maintain the Passyfier Core 100 High Rise Dehumidifier Vent 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 fly screen to remove dust and cobwebs and confirm the opening is unobstructed, then check from indoors that the push through gasket appears tight to the outer wall. After storms a quick visual check from ground level with binoculars can reassure that the cowl sits square, although external access is usually not required. For rooms that previously had mould, wash affected areas with a quality fungicidal cleaner and allow to dry fully before redecorating with an appropriate coating. Keep curtains, pelmets and tall furniture clear of the grille, maintain steady background heating in colder months and keep internal doors undercut so air can circulate gently towards the vent. Continue using bathroom and kitchen extract fans during moisture producing activities and open internal doors afterwards to encourage cross ventilation.

Q) What installation tips improve performance of the Passyfier Core 100 High Rise Dehumidifier Vent in practice?

A) Begin by choosing the actual problem room rather than a convenient location, then mark a high level position with the top of the grille within about 300mm of the ceiling and away from curtains or cupboards. When core drilling use slow steady feed and dust extraction, aim for a very slight downward angle to the exterior so a small outward fall is built in. Clean the hole thoroughly, offer the supplied plastic wedge in the lower quadrant to preserve the fall, then push the one piece duct, gasket and cowl through until the gasket compresses evenly to the façade. Adjust the telescopic tube to sit flush internally, trim if necessary, and install the grille housing square to the wall. Finally clip in the louvred grille and confirm free passage by holding a light tissue near the opening, you should feel only a gentle moderation of airflow rather than a cold stream. Keep the grille visible for easy housekeeping and consider a second unit in larger open plan spaces.

Q) How does the Passyfier Core 100 High Rise Dehumidifier Vent integrate with existing ventilation and building fabric measures?

A) The vent is designed to complement, not replace, other elements of a whole house moisture strategy. Continue to use mechanical extract in kitchens and bathrooms for short intense peaks, the Passyfier provides the quiet background control that keeps general humidity lower between those events. In well insulated, airtight flats it helps counter the side effect of trapped moisture that often follows energy upgrades, reducing the risk of persistent surface condensation on cold bridges. Because the unit limits bulk airflow while allowing vapour diffusion, heat loss is modest compared with permanently open grilles, supporting comfort and energy awareness. Its inside only installation is particularly valuable for planned maintenance in managed blocks because it avoids scaffolding in most cases and shortens appointments, which reduces disruption to residents. When combined with sensible heating patterns, door management and routine cleaning, the Passyfier Core 100 High Rise Dehumidifier Vent provides a durable, low maintenance way to protect finishes and improve comfort across compact rooms in multi storey buildings.

Technical Data Sheets

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