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The ArrestAir®-Pro 135 Wind Blast Grille is a universal external vent cover engineered for superior anti-draught performance in exposed and coastal locations. Independently tested for cross-wind behaviour, it uses ArrestAir-Pro bi-planar vane technology to balance wind pressure and maintain airflow without the noise and restriction associated with gravity flaps.
It fits over ducts up to 150mm diameter and over 225mm x 150mm airbricks, provides a measured free area of 135cm², and is supplied with stainless steel screws, plugs and installation instructions. Overall size is (L) 256mm x (W) 230mm x (H) 85mm.
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✔️ Engineered for exposed and coastal sites with ArrestAir-Pro biplanar vanes that suppress draughts and rain.
✔️ Independently tested under cross-winds to maintain airflow without rattling gravity flaps or restrictive backdraught shutters.
✔️ Universal footprint fits 150mm round ducts and 225 x 150mm airbricks, delivering a measured free area of 135cm².
✔️ Optimised geometry mitigates wind uplift and side gusts, preserving ventilation performance and occupant comfort across façades.
✔️ Supplied with stainless steel fixings and instructions, compact 256 x 230 x 85mm body suits retrofit and new-build installations.
The ArrestAir®-Pro 135 Wind Blast Grille is purpose-designed to solve the real-world shortcomings of traditional hoods and louvres. In still air many grilles appear adequate, yet on exposed elevations head-on winds can force cold air indoors while cross-winds can collapse effective free area. ArrestAir-Pro combines a protective hood and grille in a single moulded assembly, using a bi-planar vane geometry to condition both incoming and outgoing airstreams so draught is suppressed, rain is deflected, and free area is largely preserved regardless of wind direction. With no gravity flaps to flutter or stick, everyday ventilation remains stable and quiet.
The vane form creates a controlled flow path that also mitigates uplift effects from winds travelling up and over façades, a condition that often defeats conventional cowls. By keeping back-pressure low the unit supports the performance of extract fans while arresting wind-driven blasts that cause occupant discomfort. This engineered approach maintains ventilation where it is needed and limits nuisance air movement inside the room.
A universal footprint makes retrofit straightforward across common scenarios. The grille mounts neatly over a nominal 225×150mm airbrick or over round ductwork up to 150mm diameter, allowing you to upgrade draughty passive vents, protect through-wall fans, or enhance moisture-control systems such as Passyfier sleeves. The compact body measures 256×230×85mm and is supplied with stainless steel fixings and wall plugs, suiting both refurbishment and new build without visual bulk.
Performance is underpinned by testing funded by the Health and Safety Executive, focused on the critical behaviour of vents under cross-wind where many hoods lose substantial effective area. ArrestAir-Pro maintains ventilation while keeping indoor draught to a minimum, with a measured free area of 135cm² that provides generous capacity for background and appliance-related applications, subject to relevant regulations and appliance instructions. The result is a robust, low-maintenance grille that improves comfort and reliability in exposed or coastal settings, enhancing airflow stability without motors, power or added complexity.
Superior Anti-Draught Performance: Bi-planar vane geometry conditions the airstream to suppress wind-driven blasts and minimise perceived draught inside rooms, even in exposed locations.
Cross-Wind Stability Proven In Testing: Behaviour under side winds has been assessed in HSE-funded trials, helping preserve effective area where conventional cowls can lose up to half their capacity.
Low Back-Pressure For Fan Outlets: The flow path is engineered to keep resistance low, supporting extractor fan throughput while still protecting against gusts that cause reverse flow and noise.
Universal Retrofit Fitment: Installs over 225mm x 150mm airbricks or round ducts up to 150mm, making upgrades quick on refurbishment projects and compatible with common wall penetrations.
Quieter Than Gravity Flaps: There are no loose flaps to rattle or stick, so ventilation remains consistent and noise is reduced during high winds and stormy weather.
Measured Free Area Of 135cm²: Offers generous capacity for background ventilation needs, with airflow maintained more reliably across a range of wind directions.
Robust, Installer-Friendly Package: Supplied with stainless steel screws, wall plugs and instructions, with a compact 256mm x 230mm x 85mm form for neat, repeatable installations.
Designed For Harsh Environments: The hood-and-grille form helps deflect driven rain and salt-laden winds, making it well suited to coastal façades and elevated sites.
Exposed Or Coastal Properties: Wind-resistant grille for homes and flats subject to frequent gusts, cross-winds and driven rain where conventional covers cause discomfort and complaints.
Retrofit Over Draughty Airbricks: Upgrade existing 225mm x 150mm passive vents to stabilise airflow, reduce cold blasts and improve comfort without blocking essential background ventilation.
Extractor Fan Terminations: Fit over 100mm - 150mm round ducts to protect bathroom or kitchen extracts from wind-induced backflow while keeping resistance low for reliable fan performance.
Moisture-Control Systems: Complement Passyfier dehumidifier sleeve kits by moderating wind impact at the façade, helping maintain diffusion-led moisture control in changeable weather.
Mixed-Use And Multi-Residential: Standardise a robust external termination across varied exposures on housing developments to improve consistency and reduce maintenance issues.
Plant Rooms And Service Risers: Provide a tidy, durable weathering detail to round or airbrick openings where wind effects could otherwise compromise ventilation design intent.
Nominal Coverage: 225×150mm airbrick or up to 150mm diameter round duct.
Measured Free Area: 135cm².
Overall Size: 256mm width, 230mm height, 85mm depth.
Anti-Draught Technology: ArrestAir-Pro bi-planar vane arrangement for cross-wind control.
Back-Pressure: Low resistance design suitable for extractor fan outlets.
Compatibility: Retrofit over existing 225×150mm airbricks and 100–150mm ducts, including Passyfier sleeve terminations.
Installation Location: External façades including exposed and coastal sites.
Fixings Supplied: Stainless steel screws, wall plugs and printed installation instructions.
Materials And Finish: Purpose-designed hood and grille assembly with fixed vanes; no gravity flaps.
Maintenance: No moving parts; periodic visual check to keep grille free of debris.
Testing And Verification: Cross-wind behaviour assessed in HSE-funded testing with effective area measured in controlled conditions.
Regulatory Notes: When serving combustion appliances, verify whole-system ventilation against Building Regulations and appliance manufacturer guidance.
A) The ArrestAir®-Pro 135 Wind Blast Grille is a universal external vent cover designed to stabilise ventilation on exposed façades where gusts and cross-winds usually cause uncomfortable draughts, back-pressure and noise. Instead of relying on loose gravity flaps that rattle and stick, it uses ArrestAir-Pro bi-planar vane geometry inside a compact hood-and-grille body to condition the airstream. This arrangement preserves a measured free area of 135cm² while suppressing wind-driven blasts and deflecting driven rain, so background ventilation and small fan terminations remain effective in real weather rather than only in still-air test conditions. The grille fits neatly over round ducts up to 150mm diameter and over standard 225×150mm airbricks, and is supplied ready to install with stainless steel screws, wall plugs and printed instructions. With overall dimensions of 256mm × 230mm × 85mm, it offers a tidy, durable upgrade for new build and retrofit where occupant comfort, low maintenance and dependable airflow are required on coastal, elevated or otherwise exposed sites.
A) Draught complaints are often caused by uncontrolled pressure effects at the façade: head-on winds can force cold air indoors, while cross-winds can collapse the effective area of a basic hood. The ArrestAir®-Pro 135 Wind Blast Grille addresses both by combining a protective hood with fixed bi-planar vanes that slow, turn and redistribute the incoming and outgoing flow. This diffuses short, sharp gusts into a more even pressure field and resists reverse flow without the friction and chatter of dangling flaps. Because there are no moving parts, there is no flutter in storms, no sticking after salt spray, and no sudden blockage that starves extract fans. Independent, HSE-funded testing of cross-wind behaviour underlines the design intent: where conventional cowls can lose a large proportion of effective area when wind approaches obliquely, the ArrestAir-Pro geometry maintains ventilation capacity far more consistently. In day-to-day terms, that translates to fewer cold blasts, less noise at the grille and steadier background conditions inside the room.
A) The ArrestAir®-Pro 135 Wind Blast Grille is intended for external walls that face gusty, exposed or coastal conditions where conventional covers generate complaints. Its universal footprint makes it highly adaptable: it fixes directly over standard 225×150mm airbricks to stabilise background vents, or over round ducts up to 150mm diameter to protect bathroom and kitchen extract terminations without choking the fan. It is equally at home as the façade termination for moisture-control systems such as through-wall dehumidifier sleeves, where moderating wind impact helps the diffusion-led process remain effective in changeable weather. Typical applications include seaside properties, hilltop and high-rise elevations, mixed-exposure housing schemes where a single, robust detail is preferred, plant rooms and service risers that need a tidy, durable weathering piece, and retrofits where an old flap cowl has been blocked due to discomfort. Provided the installation respects Building Regulations and any appliance manufacturer guidance, the grille’s measured free area of 135cm² offers generous capacity for many domestic background and small-fan scenarios.
A) The ArrestAir®-Pro 135 Wind Blast Grille is engineered specifically to keep resistance low while delivering superior anti-draught behaviour, so it supports rather than hinders fan performance. The fixed bi-planar vanes and shaped hood create a controlled flow path that resists the face-pressure spikes which cause reverse flow and whistling at simple covers, yet the geometry avoids tight turns and narrow throats that would raise static losses. In practice, fans see steadier operating conditions across a wider range of wind directions, so their throughput remains closer to the values measured in still air. That stability matters for humidity control and odour removal, especially on tall façades where uplift effects can be severe. Because the ArrestAir-Pro approach avoids gravity flaps, there is no flap mass to overcome on start-up and no hinge friction that rises with salt or grit, both of which sap small fan performance. As with any termination, overall system performance depends on duct length, bends and fan selection, but the grille removes the wind-sensitivity penalty common to basic hoods.
A) Installation is straightforward and installer-friendly. Offer the ArrestAir®-Pro 135 Wind Blast Grille to the external wall over the existing 225×150mm airbrick or the round duct up to 150mm diameter, check for square and mark the fixing points. Drill and plug the masonry, then bed the rear perimeter with a suitable exterior-grade sealant to prevent water ingress and bypass draughts. Fix the grille with the supplied stainless steel screws, tightening evenly so the sealant compresses without distorting the body. Where the grille serves a round duct, ensure the duct stub sits proud enough to meet the grille opening and avoid a step that could trap condensate; where it serves an airbrick, ensure the brick aperture is clear of debris and old mesh. On tall façades, position to avoid direct wake effects from soffits and deep reveals where practical. After fixing, run a neat perimeter bead to weather the joint and wipe away excess. A final functional check with the fan running—or with a light tissue for passive vents—confirms free flow and a draft-free seal.
A) The ArrestAir®-Pro 135 Wind Blast Grille has no moving parts, so upkeep is minimal: a periodic visual check to clear leaves, lint or nesting material is usually sufficient, and the fixed vanes avoid the hinge wear, rattle and salt-induced seizure that plague gravity flaps in coastal air. Stainless steel fixings resist corrosion over time, while the compact 256mm × 230mm × 85mm body is easy to wipe down during façade maintenance. The grille’s measured free area is 135cm² and its cross-wind stability has been assessed in HSE-funded testing, providing reassurance where wind exposure is high. As with any ventilation terminal, correct sizing is part of a whole-system design: confirm that the selected free area and duct size satisfy Building Regulations and any appliance or fan manufacturer’s instructions, especially where combustion appliances, cooker hoods or high-duty extract fans are involved. In moisture-control and background ventilation roles, the ArrestAir-Pro approach enhances comfort and reliability without adding motors, power or service parts, making it a durable, low-maintenance choice for exposed and coastal façades.
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