Rentokil Flexi Armour rodent in Vent

Flexi Armour Vent - Rodent Proofing

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Flexi Armour Vent - Rodent Proofing

Air vents can be one of the biggest vulnerabilities on your premises, and to rats and mice, an unsecured vent is simply an open door. And the rodent getting in isn’t even the most significant part of the problem. It’s the destruction they cause once they’re inside. From damaging electrical wiring to contaminating stock and spreading disease, their presence spells trouble for businesses.

Robust Pest Proofing Solution for Air Bricks and Vents

Flexi Armour Vent provides an effective barrier against rodents that’s humane and doesn’t damage brickwork or stop airflow. It delivers robust protection, preventing costly and disruptive infestations without the need for toxic solutions.

Flexi Armour Range of Solutions to Fit Different Air Vents

Different vents, such as air bricks or circular wall vents, often require tailored solutions to ensure a secure fit and complete coverage. Understanding how to properly protect vents is essential for maintaining a safe, pest-free environment. Properly fitted mesh covers can stop rodents, insects, and other pests from gaining access indoors while still ensuring that vital ventilation is preserved, which prevents damp and air quality issues.

It is important to select vent covers that are compatible with the size and style of your building’s vents—whether air bricks, round or square vents, or larger HVAC (heating, ventilation, and air conditioning) outlets—so that installation is both effective and structurally secure.

Small Vent: Air Bricks

Designed specifically for air bricks, which are often found at the base of external walls. These bricks are essential for sub-floor ventilation but are notorious open doors for rodents. Securing the air brick with Flexi Armour Vent, prevents rodents from entering cavity walls or underfloor voids.

Medium Vent: Round, Square or Irregular Vents

A versatile solution for a variety of air vents that don’t follow standard sizes. It can be easily retrofitted over round, square or irregular vents to cover any gaps that rodents might leverage. These types of vents can be found anywhere in the property and often support building air flow.

Large Vent: Larger Openings in Commercial Buildings

Best suited for larger openings in commercial buildings, such as (heating, ventilation, and air conditioning) HVAC system outlets. These are essential for maintaining climate control and air quality in large spaces but can be vulnerable to pests. Vent provides a robust barrier for these exit and entry points without compromising the building's ventilation requirements.

Why Choose Flexi Armour Vent?

Our innovative technology uses a discreet, yet robust flexible knitted steel mesh combined with rubber, allowing it to adapt to uneven surfaces while remaining fully weatherproof. Its design forms an effective physical barrier that helps to prevent rodent entry.

  • Effective prevention: Averts rats and mice from leveraging a common entry point, significantly reducing the risk of indoor infestations.
  • Professional seamless fit: Expertly installed to create a seamless barrier, even on uneven surfaces. Flexible edges ensure no gaps remain on uneven surfaces while the permeable design ensures essential airflow is not restricted. Ensuring immediate protection with minimal operational disruption.
  • Quick to install: A no-drilling design that minimises disruption and avoids damage to your property’s brickwork or structure. At the same time, the permeable mesh ensures essential airflow to the building is maintained, making it suitable for use across a wide range of property types.
  • Proven defence: Rigorously tested to withstand outdoor elements, heavy rodent pressure, physical force, abrasion, and environmental stress for over 90 days.
  • Supports rodenticide reduction: A proactive, rodenticide free solution that helps mitigate the risk of rodent infestations, by preventing entry whilst causing no physical harm to rodents. So, minimising the need for reactive control measures such as rodenticides.

Why do Weep Vents (Holes) Need Proofing?

Weep vents (holes) are small gaps between bricks or stonework, providing essential ventilation and drainage of wall cavities in buildings. These holes limit the build-up of moisture in cavity walls, reducing the risk of property issues. However, they can be 'gateways' for rodents and insect pests to enter your premises. Once in the wall cavity, pests can travel throughout the rest of the building, often undetected.

Therefore, protecting weep holes with dedicated mesh covers is a practical way to deter mice, rats, wasps, and other unwanted insect visitors from accessing your property’s structure. By maintaining the necessary airflow and drainage, Flexi Armour proofing mesh vent covers help prevent damp problems while keeping your building safe from infestation. This extra layer of defence improves the overall integrity and can save you from costly repairs in the future.

Flexi Armour Weep Vent Rodent Proofing

Flexi Armour Weep is an effective solution for proofing weep holes (or vents), without damaging brickwork and mortar. This pest proofing is made from highly resilient, yet flexible, stainless steel, which prevents insect and rodent pests from accessing wall cavities in all types of buildings. The mesh design allows ventilation and drainage to continue as normal, ensuring that moisture can escape and the property stays protected from damp or mould.

Since the material is both durable and corrosion-resistant, it can withstand harsh outdoor conditions over many years without losing its performance. Its simple installation means you can quickly secure your property, while meeting essential building regulations and maintaining proper airflow. Therefore, Flexi Armour Weep Vents offer peace of mind by providing robust, long-lasting pest protection without the need for complicated or invasive alterations.

This versatile proofing solution can be fitted to weep vents of any size, without compromising the essential ventilation and drainage they provide. The effective proofing of all types of gaps, cracks, holes and vents is vital to minimise the risk of pest activity inside your premises.

Flexi Armour Vents: Sustainable Pest Proofing

These effective pest proofing solutions deny insect and rodent pests’ access to buildings from external areas via air vents and weep holes. This also prevents them from finding refuge in the cavity walls and potentially nesting there. Flexi Armour air vent and weep vent have the benefit of not restricting airflow, allowing moisture to leave the inner wall cavity protecting the integrity of your  property.

Using these robust methods of pest proofing to prevent access helps reduce the need to use rodenticides or insecticides within your premises. This sustainable approach supports your audit compliance by proactively minimising the risks associated with internal pest activity. Flexi Armour targeted proofing solutions assist UK food safety, health & safety, and CRRU (The Campaign for Responsible Rodenticide Use) regulations, to help reduce the rodenticide impact on UK wildlife.

By installing high-quality, Flexi Armour mesh covers on air bricks and weep vents, you help maintain vital airflow and prevent future blockages caused by debris or nests. Since these covers are durable and resistant to corrosion, they offer long-lasting protection with minimal maintenance. While safeguarding your building against mice, rats, and insect pests, this solution also helps preserve the structural integrity of your property.

Rodent in vent visuals created with the assistance of AI.

Flexi Armour Vents FAQs


  • Can mice enter through air bricks?

    Yes, mice can easily enter through air bricks. Because they can squeeze through gaps as small as 6mm (roughly the width of a pencil), the standard holes in clay or plastic air bricks are often large enough for them to pass through. Once inside, they gain access to wall cavities and floor voids.


  • What can I put in vents to keep mice out?

    To secure vents, install professional-grade specialised covers made of stainless steel mesh like Flexi Armour proofing range vents. These allow for essential ventilation while providing a physical barrier. For short term, emergency fixes, galvanised hardware cloth or knitted copper mesh can be stuffed into gaps, as a temporary measure, as these materials may resist gnawing and do not rust quickly.


  • Can rats squeeze through air vents?

    Yes, rats are highly adept at entering air vents. An adult rat only needs a gap of roughly 20mm to gain entry, and they can collapse their rib cages to fit through tight spaces. If a vent is made of plastic or clay, rats will simply chew the opening wider to facilitate entry.


  • What material can rodents not chew through?

    Rodents find it difficult to chew through high-quality stainless steel, galvanised steel, or solid masonry. Their teeth, while strong enough to gnaw through lead, plastic, and wood, cannot gain purchase on the hard, slick surface of heavy-gauge metal mesh.


  • Can air vent covers prevent all types of rodents from entering?

    High-quality stainless or galvanised steel air vent covers are effective against all rodents, including mice, rats, and squirrels. However, the effectiveness depends on the mesh size; it must be small enough to stop mice (under 6mm) but strong enough to withstand rat gnawing. Proper installation is critical to ensure there are no gaps around the edges.

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