Awaab's Law 2025 Guide
Nuaire PIV units
Damp Proof Membrane
Damp Proof Cream
Tanking Slurry Systems
Explore Newton
Shop Wykamol Membranes
Waterproof Membrane Kits
SX70 Wood Stains
Boracol
Crack Sealing
Crack Stitching Bars
Explore Soudal
Fix ALL Rewards!
'Genius Gun' Foam Range
Special Offers
Wonder Grip Hub
Harris Brushes
Protection Films
Browse All Deals
How To Damp Proof Walls
Woodworm: A Homeowners Guide
How To Seal Window Frames
The Passyfier Sleeved 230 Dehumidifier Vent is a through-the-wall, non-mechanical solution that passively removes excess moisture vapour while keeping draughts and heat loss to a minimum. A mineral-wool core allows vapour to diffuse out of the home without the need for fans, so the unit operates silently around the clock and can transmit up to 2.3 litres of water per day.
One vent serves rooms up to 20m². It fits a nominal 225 x 150mm opening (the size of a standard 9 x 6 inch airbrick) and is supplied complete with a louvred internal plastic grille with flyscreen and a pre-fitted external airbrick available in a range of exterior colours.
Where walls are deeper than standard, a Passyfier 230 Extension Sleeve can be purchased separately to add a further 112mm of sleeve length. Other optional accessories, such as a Wind-Blast Cowl for very exposed locations, are also available separately.
Colour
Great product, great service!
Brilliant piece of equipment works great.
Free Delivery
on orders over £100(ex. VAT, mainland UK only)
Free Help & Advice
Call 01355 222 777Mon.-Fri 8:30am - 4:15pm, or email us
Next Day Delivery
Order Before 2:30pm for Same Day Despatch (terms apply)
Great Service
A proudly independent family business with 40 years experience
✔️ Passive, non-mechanical vapour diffusion vent removes moisture continuously with zero running cost and noise.
✔️ Transmits up to 2.3 litres daily and serves rooms up to 20m², stabilising indoor humidity.
✔️ Mineral-wool core permeable to vapour resists bulk airflow, minimising draughts and heat loss in use.
✔️ Telescopic sleeve fits nominal 225 x 150mm opening, adjustable 240–340mm to suit typical wall thicknesses on installation.
✔️ Includes louvred internal plastic grille with flyscreen and external airbrick colour options.
Modern, well-insulated dwellings can trap the moisture generated by everyday living. The Passyfier Sleeved 230 provides a controlled diffusion path through the wall, using the natural difference in vapour pressure, typically higher indoors during the heating season, to drive moisture outward through a specially engineered mineral-wool slab. Because this mechanism is diffusion rather than bulk airflow, it operates quietly and continuously, with negligible energy penalty and without the chilling draughts that often lead occupants to block conventional vents.
At the core of the unit is a warm, telescopic sleeve that houses a dense, tortuous mineral-wool section. Its pore structure is effectively transparent to water vapour yet resists direct through-draughts, allowing humidity to escape even on cold, damp days when outside air is near saturation and indoor air is warm. By helping to maintain indoor relative humidity within a healthier range, the Passyfier reduces surface condensation on glazing, in cold corners and at thermal bridges, limiting black mould growth and protecting finishes, furnishings and decorations.
Designed for rapid retrofit as well as new-build, the vent fits a nominal 225 × 150 mm aperture and commonly replaces an existing airbrick. The telescopic sleeve adjusts from 240 mm to 340 mm to suit most wall thicknesses; where walls exceed this range, the separately purchased Passyfier 230 Extension Sleeve adds a further 112 mm while preserving the continuous warm-sleeve principle. The external airbrick is factory fitted and offered in a range of exterior colours to blend with the façade, while the internal louvred plastic grille incorporates an integral flyscreen for cleanliness.
Positioned at high level in living rooms and bedrooms, the unit works continuously with no running cost, complementing mechanical extract in kitchens and bathrooms by managing the background moisture load in habitable spaces. In typical domestic conditions, a single vent can transmit up to 2.3 litres of water vapour per 24 hours, helping to stabilise indoor humidity without introducing noticeable draughts. For larger open-plan areas, two vents on opposing walls improve distribution and overall effectiveness.
The Passyfier Sleeved 230 supports broader condensation-control strategies aimed at protecting occupants and building fabric. Good practice includes treating any existing mould with a quality fungicidal wash before redecorating and retaining dedicated mechanical extraction for wet rooms. Optional add-ons, such as a wind-blast cowl for very exposed or coastal sites, can be purchased separately where local conditions demand additional protection.
Passive Dehumidification With Minimal Heat Loss: The mineral-wool diffusion core allows moisture vapour to escape under natural vapour-pressure differences while limiting bulk airflow, reducing condensation without cold draughts or noticeable heat penalty.
Silent, Continuous Operation: With no fan, motor or electrics, the vent works 24/7 with zero energy use, providing dependable background moisture control without user input.
High Moisture Transmission Capacity: Under typical domestic conditions a single unit can transmit up to 2.3 litres of water per day, helping to stabilise relative humidity and discourage black mould.
Retrofit-Friendly Telescopic Sleeve: The warm sleeve adjusts from 240 to 340mm and fits a nominal 225 x 150mm opening, making it a straightforward replacement for a standard 9 x 6 inch airbrick.
Extension For Thick Walls: The Passyfier 230 Extension Sleeve (purchased separately) adds 112mm of sleeve length for deeper constructions while maintaining the continuous warm-sleeve detail.
Draught-Limiting Design: The tortuous mineral-wool pathway tempers airflow so occupants remain comfortable and are not tempted to block the vent.
Regulation-Aligned Background Vent: Provides an effective area (on the plane normal to airflow) in excess of 8,000mm², aligning with Building Regulations guidance for habitable rooms.
Low-Maintenance Construction: With no moving parts, upkeep is limited to occasional cleaning of the internal plastic grille and flyscreen.
Habitable Rooms In Houses And Flats: Background humidity control in living rooms, dining rooms and bedrooms up to 20m² where airtightness and insulation have increased condensation risk.
Open-Plan Living Areas: Larger spaces where two vents on opposing walls improve moisture diffusion and stabilise relative humidity across the floorplate.
Retrofit Condensation Remediation: Replacement of an old airbrick or addition during refurbishment where recurrent window condensation and mould are reported.
New-Build And Conversions: Inclusion at high level to protect the fabric during drying-out and to provide long-term moisture management alongside kitchen and bathroom extract.
Exposed Or Coastal Sites: Where wind exposure is severe, an optional wind-blast cowl can be purchased separately to help maintain performance.
Operating Principle: Passive vapour diffusion through a tortuous mineral-wool core; non-mechanical and silent in operation.
Moisture Vapour Transmission: Up to 2.3 litres per 24 hours under typical domestic conditions.
Maximum Served Floor Area: 20m² per vent; use two opposed units in larger open-plan rooms.
Effective Area: Exceeds 8,000mm² on the plane normal to airflow for background ventilation of habitable rooms.
Wall Aperture: Fits nominal 225mm x 150mm opening; typical replacement for a 9" x 6" Airbrick.
External Airbrick Face: Approximately 215mm x 140mm; pre-fitted to the unit and available in a range of exterior colours.
Telescopic Sleeve Length: Adjustable from 240mm to 340mm.
Extension Option: Passyfier 230 Extension Sleeve adds 112mm of additional sleeve length (purchased separately).
Internal Grille: Louvred plastic grille with integrated flyscreen, supplied for a clean interior finish.
Installation Guidance: Position at high level where practical; treat existing mould with a fungicidal wash before redecorating; retain separate mechanical extraction in kitchens and bathrooms.
Limitations: Not to be used to supply combustion air to gas, oil or solid-fuel appliances.
Supplied With: Sleeved vent assembly with pre-fitted external airbrick, internal plastic grille and installation instructions.
Work from a safe platform with good lighting and keep the work area clear of trip hazards. Wear suitable work clothing together with safety goggles, gloves and a dust mask when cutting masonry. Before any cutting or drilling, survey the location thoroughly to avoid pipes, cables, load-bearing lintels and damp-proof courses.
Control dust with careful technique and collection where possible, keep bystanders away, and handle cement and sealants in line with the manufacturers’ guidance. If you are not confident carrying out through-wall work, engage a competent builder to complete the installation.
Install the vent in the room that is experiencing condensation, typically the colder, stale corner furthest from the room entrance on an external wall. Position it at high level and set the top of the unit no more than 12 inches (about 300mm) below the ceiling. This high position is important because the warmest, most moisture-laden air pools near the ceiling; placing the vent here maximises vapour diffusion while keeping felt draughts at occupant level to a minimum.
A high-level location is also discreet on the side elevation of a house. If high-level fitting is impractical because of pipework or lintels, the unit may be fitted at low level around 300mm above the finished floor, but performance is typically reduced by about half at low level. In kitchens and bathrooms retain or install mechanical extract; ideally place the vent diagonally opposite the extractor and, in kitchens, not closer than about 1.5m to a cooker hood.
Confirm wall thickness and check that the standard telescopic sleeve (240–340mm) will span the wall; where it does not, order the Passyfier 230 Extension Sleeve, which adds a further 112mm. Assemble the tools and materials you will need, including a 225×150mm opening template, masonry saw or drill and stitch-drill bits, a pointing trowel, suitable screws and plugs, a quality fungicidal wash for aftercare, and an appropriate mastic for internal sealing.
The vent provides passive, background moisture control and is not a substitute for rapid mechanical extraction of short-term peaks in kitchens and bathrooms. It must not be used to provide combustion air for gas, oil or solid-fuel appliances.
Install at high level wherever possible, keep the mineral-wool core protected from free airflow by ensuring the sleeve is correctly bedded, and maintain a slight fall to outside so any incidental moisture runs outward.
Where the slider tube crosses an open cavity, create a continuous internal mastic seal to prevent cavity draughts. Treat any visible mould with a fungicidal wash before redecorating so the installation starts with clean, dry surfaces.
Mark The Position: From inside the affected room, mark the intended high-level location on the external wall, keeping clear of obvious services and structural bearings. Transfer the position to the outside by measuring from fixed points, or drill a fine pilot hole through the centre of the planned opening to establish a datum from one side to the other.
Form The External Opening: From outside, use a 225 x 150mm template to mark a neat rectangle and cut a 9” x 6” opening through the outer leaf. On rendered finishes it can be helpful to use the supplied polystyrene packaging as a marking template for accuracy. Remove debris and dress the edges.
Establish The Internal Opening: Temporarily cover the cavity to catch falling debris, then return indoors and cut the matching 225 x 150mm opening through the inner leaf using the pilot hole as the centre. Keep the edges true so the internal grille will sit flush.
Dry-fit The Sleeve Assembly: Offer the Passyfier 230 sleeve into the opening and adjust the telescopic section so it fits the wall thickness (use an additional Extension Sleeve if required). Check that the pre-fitted external airbrick and the internal slider duct are level with each other and that the main duct is set with a slight outward fall; this outward slope is important for reliable performance.
Bed The Assembly: With the main duct in place to act as a former, bed the unit into position using cement mortar, taking care not to distort the slider by over-tightening or forcing. Ensure both faces finish flush and square with the masonry and that the pre-fitted external airbrick sits neatly to the façade.
Seal The Cavity: In open-cavity constructions where the slider tube passes across the cavity, run a continuous internal mastic seal around the penetration so that air cannot bypass the mineral-wool core within the sleeve.
Fit The Internal Louvre: Once the bedding mortar has taken an initial set, fix the internal louvred plastic grille (with integral flyscreen) using the screws and plugs supplied. If the wall requires making-good or skimming, delay fixing the grille until the surface is ready to receive it, then secure it firmly without distorting the face.
Make Good And Clean Down: Finish the reveals neatly, remove dust and waste from the area, and wash any previously affected surfaces with a fungicidal wash following the manufacturer’s instructions before redecorating.
Explain to the household that the vent is entirely passive and has no switches or electrics to operate. It works continuously by allowing moisture vapour to migrate outdoors while limiting draughts.
Advise occupants not to block the grille and to keep furniture or curtains from covering the opening. Reinforce good practice in wet rooms by using local mechanical extract and keeping doors closed during cooking or showering, then opening them for cross-ventilation once steam has cleared.
There are no moving parts and the vent is essentially maintenance-free. Once or twice a year, lightly vacuum or wipe the internal grille and flyscreen to remove dust and cobwebs, and check the pre-fitted external airbrick for debris. In exposed or coastal locations consider a periodic visual check after storms to confirm the external face is clear.
If signs of condensation reappear, review housekeeping first, use of extract fans, heating patterns and internal door positions, before assuming a fault with the vent.
If rooms previously suffered from mould, complete the job by washing down affected walls, ceilings and skirtings with a quality fungicidal wash and allow to dry fully before redecorating. Paint with a suitable mould-resistant coating where risk remains high.
In open-plan living areas, performance improves when two vents are installed on opposing walls. In kitchens maintain at least 1.5m separation from cooker hoods; in bathrooms a humidistat-controlled extractor fan remains essential for peak moisture removal. The vent operates at zero running cost and is designed to be left unobstructed at all times.
Each vent is suitable for rooms up to about 20m². When a thicker-than-average wall is encountered, the Passyfier 230 Extension Sleeve can be purchased separately to extend the sleeve by an additional 112mm while preserving the warm-sleeve principle through the wall.
The external airbrick is supplied pre-fitted and is available in a range of exterior colours to blend with common façades. Optional add-ons for particularly exposed sites can be purchased separately if required.
Always install at high level where practicable and set the top of the unit no more than 12 inches below the ceiling to target the warm, moisture-rich air layer and promote efficient vapour diffusion with minimal perceived draught.
Maintain a slight outward fall on the duct and form an internal mastic seal where the sleeve crosses an open cavity so performance is not diluted by bypass draughts.
With careful siting and a neat installation, the Passyfier 230 provides silent, continuous background moisture control that works alongside mechanical extraction to protect the building fabric and improve comfort.
A) The Passyfier Sleeved 230 Dehumidifier Vent is a through-the-wall, non-mechanical unit that passively removes excess moisture vapour from homes to reduce condensation and black mould. It relies on a mineral-wool diffusion core that allows water vapour to migrate outdoors while resisting bulk airflow, so it works without fans, electrics or noise. In typical domestic conditions a single vent can transmit up to 2.3 litres of water vapour per day, stabilising indoor relative humidity in living rooms and bedrooms. Because it tempers airflow rather than admitting a free draught, it minimises heat loss and avoids the chilling currents that make occupants block vents. The product fits a nominal 225 × 150 mm opening, the size of a standard 9 × 6 inch airbrick, and is supplied with a louvred internal plastic grille with an integrated flyscreen plus a pre-fitted external airbrick. One Passyfier serves rooms up to about 20 m², with two vents recommended on opposing walls for larger open-plan spaces. The result is quiet, continuous moisture control at zero running cost that protects finishes and improves comfort.
A) The Passyfier Sleeved 230 operates by vapour diffusion, not by forced ventilation, using the natural pressure difference between warm indoor air and cooler outdoor air. Its telescopic sleeve houses a dense, tortuous mineral-wool section that is effectively transparent to water molecules yet resists the direct, high-velocity airflow that causes draughts. Moisture vapour migrates through this core towards outside, even on cold, damp days when the outdoor air is near saturation but at a lower temperature. Because diffusion is a molecular process, it continues 24/7 without noise, controls or energy use, and with far lower heat loss than an open airbrick. The warm sleeve concept also helps maintain temperature through the wall thickness so the diffusion path remains effective. No user interaction is required once the unit is installed correctly. This passive approach is ideal for modern airtight homes where background humidity, not fresh-air volume, is the driving issue.
A) For optimum performance the Passyfier Sleeved 230 should be installed at high level on an external wall in the problem room, with the top of the unit no more than about 300 mm below the ceiling. Warm, moisture-laden air naturally pools near the ceiling, so a high-level position maximises vapour capture while keeping any felt air movement away from occupant level. In living rooms and bedrooms, choose the colder, stale corner furthest from the door if possible, as this is where condensation often appears. Avoid siting the internal grille behind curtains or furniture that could obstruct diffusion, and keep at least 1.5 m away from cooker hoods in adjoining kitchen areas. In open-plan spaces, two vents on opposing walls provide a more even effect. If high-level fitting is impractical due to lintels or services, a low-level position around 300 mm above the floor is acceptable but performance is typically reduced compared with a high-level location. Always retain separate mechanical extract in kitchens and bathrooms to handle short-term moisture peaks.
A) One Passyfier Sleeved 230 is intended for rooms up to about 20 m² in normal domestic use, making it suitable for typical bedrooms and many living rooms. In larger or open-plan areas, install two units on opposing external walls to improve moisture distribution and maintain stable relative humidity across the floorplate. If a home has several rooms with persistent condensation, select the worst-affected spaces first and reassess after a heating cycle or two, adding further vents only where needed. The unit’s effect is cumulative with good housekeeping, such as using bathroom and kitchen extract fans and maintaining consistent background heat in colder months. Remember that the device manages continuous background moisture rather than short, intense bursts. Keeping internal doors undercut or slightly ajar also helps air movement towards the vented zones. With sensible siting and complementary extract, most homes achieve noticeable reductions in window streaming and mould growth.
A) The Passyfier Sleeved 230 is deliberately engineered to minimise draughts and thermal penalty while allowing moisture to escape. Its mineral-wool core provides a tortuous pathway that resists bulk airflow, so you do not get a free jet of cold air as you would through an open vent. Installed at high level, any moderated air movement is kept well away from seating height, which further reduces perceived draught. Heat loss is correspondingly low because the diffusion pathway does not maintain a continuous stream of cold outdoor air through the wall. Correct installation with a slight outward fall and a sealed cavity interface prevents bypass airflow that could undermine comfort. Occupants therefore tend to leave the vent unobstructed, ensuring long-term performance. In practice, homes feel drier and less clammy, which many users perceive as warmer at the same thermostat setting.
A) No. The Passyfier Sleeved 230 provides passive background moisture control in habitable rooms and is not a substitute for rapid mechanical extraction at moisture sources. Kitchens and bathrooms generate short-term, high-intensity humidity during cooking and showering that must be removed quickly by compliant extract fans. The Passyfier works alongside those fans to manage the ongoing moisture load in bedrooms and living areas, preventing the slow build-up that leads to window condensation and black mould. This combined approach mirrors good building-services practice in both retrofit and new-build. Keep doors closed during moisture-producing activities, then open them for cross-ventilation once steam has cleared. With this routine in place, the vent helps maintain a healthier relative-humidity band throughout the day and night. The result is better fabric protection and indoor air quality without additional energy use.
A) The Passyfier Sleeved 230 fits a nominal 225 × 150 mm wall opening, which corresponds to a standard 9 × 6 inch airbrick aperture in refurbishments. The telescopic warm sleeve adjusts from 240 to 340 mm to suit most wall thicknesses, and an optional Passyfier 230 Extension Sleeve adds a further 112 mm where walls are deeper. The pre-fitted external airbrick face is approximately 215 × 140 mm and is available in a range of exterior colours to blend with common façades. Internally, a louvred plastic grille with an integrated flyscreen is supplied for a clean finish and easy housekeeping. Installation includes setting a slight outward fall on the sleeve, bedding the components flush and square, and forming a continuous internal mastic seal where the tube crosses an open cavity. Clear instructions accompany the unit to guide competent installers through marking out, forming the opening, fixing and making good. With careful siting, most retrofits are straightforward replacements for old airbricks.
A) The Passyfier Sleeved 230 is supplied complete with a pre-fitted external airbrick in a choice of exterior colours, plus a louvred internal plastic grille with an integrated flyscreen. For walls deeper than the standard sleeve range, the Passyfier 230 Extension Sleeve is available separately and adds 112 mm of length while preserving the warm-sleeve principle. In very exposed or coastal locations, an optional wind-blast cowl can be purchased to help maintain performance under severe wind conditions. Standard fixings and installation guidance are included to support a neat, repeatable fit. These accessories allow the system to be tailored to a wide variety of constructions and exposures. By matching the external colour and managing site exposure, the installation remains discreet and effective. All options are designed to work seamlessly with the core diffusion concept of the product.
A) Installation begins by marking a high-level position in the affected room and forming a neat 225 × 150 mm opening through the wall, typically replacing an existing 9 × 6 inch airbrick. The telescopic sleeve is dry-fitted and adjusted to the wall thickness, then set with a slight outward fall so any incidental moisture drains outside. The pre-fitted external airbrick and the internal slider duct are bedded flush and square, taking care not to distort the sleeve. Where the tube crosses an open cavity, a continuous internal mastic seal is formed around the penetration to prevent bypass draughts. The louvred internal grille is fixed after making-good, and the installation is finished by cleaning down and treating any existing mould with a quality fungicidal wash before redecorating. Competent installers find the process predictable and tidy, and the vent begins working immediately at zero running cost. Full instructions supplied with the unit should be followed throughout.
A) The Passyfier Sleeved 230 has no moving parts and requires only light housekeeping to remain effective. Once or twice a year, vacuum or wipe the internal louvred grille and flyscreen to remove settled dust and cobwebs that could impede diffusion. In exposed locations, a quick visual check of the external airbrick after storms ensures the opening remains clear of debris. If the room previously suffered from mould, treat surfaces with a fungicidal wash and allow to dry fully before repainting, ideally with a mould-resistant coating. Good everyday habits, using extract fans, keeping internal doors undercut or slightly ajar, and maintaining steady background heat in winter, support the vent’s passive operation. There are no filters, motors or controls to service, and there is no energy consumption to monitor. Provided the grille is kept unobstructed, the vent will continue to operate silently for many years.
A) The Passyfier Sleeved 230 is a background dehumidification device for habitable rooms and must not be used to supply combustion air to gas, oil or solid-fuel appliances. It does not replace compliant mechanical extraction in kitchens and bathrooms, which remains essential for rapid moisture removal at source. Where walls are unusually deep, an extension sleeve should be used to maintain the warm-sleeve principle; do not bodge with gaps that allow bypass airflow. Avoid siting where the internal grille will be hidden behind curtains or furniture, as this compromises diffusion. If a property has bulk water ingress, leaks or penetrating damp, those defects must be addressed first; the Passyfier deals with airborne moisture, not liquid water. Always install with a slight outward fall and seal cavity crossings to prevent unintended draughts. Following these constraints ensures reliable, low-draught performance.
A) Black mould thrives where surfaces repeatedly become cold and damp due to high indoor humidity and weak air movement. The Passyfier Sleeved 230 reduces the underlying humidity by continuously diffusing moisture vapour to the outside, which in turn cuts surface condensation on glazing, cold corners and thermal bridges. With relative humidity kept in a healthier band, spores are less likely to germinate and grow, and redecorated areas stay clean for longer. Because the vent tempers airflow and minimises draughts, occupants are less inclined to block it, so the prevention strategy remains active year-round. Treat any existing mould with a fungicidal wash before repainting so the installation starts with clean, dry surfaces. Combine the vent with routine use of extract fans during moisture-producing activities to address short-term peaks. This two-pronged approach protects both décor and fabric without adding to energy bills.
A) The Passyfier Sleeved 230 provides an effective area on the plane normal to airflow in excess of 8,000 mm², which aligns with the intent of Building Regulations guidance for background ventilation in habitable rooms. Unlike an open airbrick that can cause discomfort, the diffusion core moderates airflow while still enabling continuous moisture control. In practice, the unit is often used to replace uncontrolled vents during refurbishment to deliver a more comfortable, low-loss solution. It complements, rather than displaces, the requirement for mechanical extract in kitchens and bathrooms. Specifiers appreciate the predictable geometry, a nominal 225 × 150 mm aperture and adjustable 240–340 mm sleeve, when coordinating openings and finishes. With optional colour-matched external airbricks, façades can be maintained sympathetically. Always verify whole-house ventilation strategies against the latest regulatory requirements for the specific project.
A) Position the Passyfier Sleeved 230 high on the wall, keep the internal grille clear of coverings, and ensure the sleeve has a slight outward fall to drain any incidental moisture. Use bathroom and kitchen extract fans during cooking and showering, keeping doors closed until steam has cleared, then open for cross-ventilation. Maintain steady background heating in colder months so indoor air can carry moisture without reaching saturation at cold surfaces. In larger rooms, install two vents on opposing walls to even out the effect across the space. Give the internal grille and flyscreen a light vacuum once or twice a year to remove dust and cobwebs. If the installation crosses an open cavity, check that the internal mastic seal remains intact to prevent bypass airflow. Treat any existing mould with a fungicidal wash before redecorating so the benefits of lower humidity are not masking residual contamination.
A) If your wall thickness exceeds the standard 240–340 mm sleeve adjustment, fit the Passyfier 230 Extension Sleeve, which adds a further 112 mm while preserving the continuous warm-sleeve path through the wall. Maintaining this continuity is important to keep the diffusion route effective and to avoid cold bridges that could attract condensation. In very exposed or coastal locations, consider the optional wind-blast cowl to help maintain stable performance under severe wind conditions. Always set the installed sleeve to a slight outward fall and form a continuous internal mastic seal where the tube crosses an open cavity to prevent bypass airflow. The pre-fitted external airbrick is available in a range of colours to blend with façades, which is useful when adding vents on prominent elevations. Following these details ensures comfort is maintained while moisture control remains dependable. With the right accessory choices, the system adapts well to a wide variety of constructions and exposures.
Description
Installation
FAQ's
Data Sheets
