Anti Flood Airbrick Covers


The Airbrick Cover is compact to store and takes only minutes to install.

Anti Flood Airbrick Covers


The Airbrick Cover is compact to store and takes only minutes to install.

The new M3Floodtec Airbrick cover has been designed to cover single or double airbricks and can provide protection from flooding having been tested to BS 851188-2019.


325mm x 180mm overall

Stock: In Stock


The airbrick cover is suitable to provide flood protection to any type of airbrick that is either flush fitting or recessed into the face of the building wall and is suitable for vents up to 280mm x 140mm in size.

  • Cost effective solution to stop ingress of water
  • Takes minutes to install after first application
  • Available in standard terracotta
Anti Flood Airbrick Covers Key Points

The airbrick cover is suitable to provide flood protection to any type of airbrick that is either flush fitting or recessed into the face of the building wall and is suitable for vents up to 280mm x 140mm in size.

  • Cost effective solution to stop ingress of water
  • Takes minutes to install after first application
  • Available in standard terracotta

The M3 Floodtec Airbrick cover is a purpose manufactured enclosure with water seal that is designed for temporary surface mounting to an existing Airbrick fixed to an external wall. The Airbrick cover should be bolted into place in accordance with the fixing instructions prior to the onset of a flood event such that the existing airbrick is sealed prior to any flood water reaching the level of the existing airbrick.

The cover is not a permanent fixture. Once the flood condition has passed and the waters have drained away the airbrick cover should be removed so as to let air flow into the building through the existing airbrick. Failure to remove the cover may result in potential damp issues inside the building.

Quality tested & certified.

Our Anti Flood Airbrick Covers have been thoroughly tested and checked, time and again, and proven to meet a recognized industry standard.

Tested & Certified to KM713574

Tested by BSI to the new British Standard BS 851188

Technical Information

BSI Standards

The Airbrick cover has a certificated BSI Kitemark number KM713574 and meets the requirements of BS 851188:2019. M3 Floodtec Airbrick Covers are tested in accordance with the requirements of BS 851188:2019 to a flood depth of 600mm.

Leakage Rates

The amount of water passing the cover when installed correctly should be no greater than 10ml per air brick per hour in accordance with BS 851188:2019 500ml/h/m.


Length: 325mm x Height: 180mm

  • Produced from aluminium sheet and closed cell EPDM foam.
  • Closed cell structure makes it impermeable to air and water.
Cleaning, drying and storage

Following use in a flood event the airbrick cover should be removed, cleaned by washing in clean water, left to dry then stored in a suitable safe place ready for future deployment.

Safety Precautions

The Airbrick cover will work as designed so long as both of the fixings are installed and the securing handwheel nuts are tightened as far as possible- these will be sufficient tightened by hand- Spanners are not required. Always make sure that the washers are installed correctly.

Check and inspect the inner foam seal before installing the cover plate, if damaged contact M3Floodtec for advice before deployment.

Make sure the existing Airbrick is clean and free from obstructions and protrusions before fixing.

Once installed and in the event of a flood condition do not attempt to remove the airbrick cover or access the flood water, this is dangerous and could place you in a position of drowning.

Risk Assessment

The use and deployment of any flood defence product should be considered in the context of the building relative to the risk of possible flooding. Single products alone may not give adequate protection to the whole building. It is therefore recommended that a full flood risk survey is undertaken to assess where flooding may ingress into the building and as such what measures should be deployed.

Flood risk surveys should be undertaken by properly trained and accredited surveyors, for details of approved Companies contact the Environment Agency web site

The M3 Floodtec Airbrick cover is designed as a temporary cover to fix over existing airbricks that are part of a general building’s fabric. They can be installed into existing masonry airbricks but must not be used on Steel air vents or existing plastic airbricks.

The product is designed to be installed before a flood event happens and then removed after the flood has passed. The product is not designed as a permanent flood prevention fixture and attempting to fix the air brick cover during a flood event is not recommended.

If deployed correctly the product will protect against a prolonged flood however permanent deployment in a submerged condition is not recommended. If this condition is a potential expert advice should be sought to consider taking the airbrick out of potential risk.

Maintenance Procedures

General Maintenance is not required on this product apart from a general wash in clean water after using in flood conditions.


The M3 Floodtec Airbrick cover is designed for multiple deployments and should last for 25 years plus if looked after. The product only requires a general clean after use and can be stored in a garage or store room under normal conditions indefinitely.

Other Information

The Airbrick cover is a manually installed product and once in position will remain static. There is no automatic function with the product. The Anchor sleeves are installed into the existing airbrick and once installed remain in position permanently for future use.

The products designation as a Manual, reusable product there is no automation associated with this product.

There is no requirement for periodic testing for this product.

The Airbrick cover can be used on any existing masonry airbrick regardless of what type of building the airbrick is installed in.

The Airbrick cover is manufactured from aluminium and polyurethane. Disposal of the product at end of life is non hazardous and recommendation is for recycling at a scrap metal or local Council disposal site.

The Airbrick cover is designed for deployment in flood conditions, this by definition will have a degree of polluted water and this will not affect the performance of the product under normal conditions. The product is designed for general flood and sea water flooding conditions.

If the product is being proposed for installation in locations where high levels of aggressive chemicals are present expert advice from your Flood risk surveyor should be sought prior to deployment.


The following checks are recommended

  • Check sleeve anchors are in place
  • Check for obstructions & remove
  • Check inside seal for rips
  • Check washers are in place

If the cover is not sealing, remove clean surfaces and replace.

Installation Preparation

The Airbrick can be installed against any existing masonry, brick, plastic, or metal air grillage providing that the opening is no greater than 280mm x 140mm. The existing air brick must be clean and free from loose material and obstructions as should the surrounding wall face.

The pointing to the brick or masonry around the airbrick must be in good condition and not cracked or broken, if this is evident, please contact M3Floodtec at

A minimum 20mm is required around the airbrick on all 4 sides as this provides the area around which the cover will seal.

Pre-Flood Deployment installation

The equipment pack contains the following:

  • 1 x Airbrick cover plate
  • 2 x  Plastic handle thumb screws
  • 2 x Rubber Washers
  • 2 x Nutcert wall anchors
  • 1 x 10mm Masonry drill
  • 1 x Drill hole Template
  • Fitting Instructions
  • Maintenance Instructions

1.  Position the drill template to the wall so that it is roughly central to the airbrick and such that the 2 holes are equidistant from the centre of the airbrick on the horizontal axis making sure that the alignment of the holes are level across the airbrick.

    2. Fix the template to the wall with tape.

    3. Mark the position of the 2 holes with a pencil or chalk onto the wall face.

    4. Remove the template.

    5. Using the drill bit provided drill 2 holes into the wall to a depth of 45mm

    6. Insert the nutsert into the hole and using a light hammer drive the nutsert into the hole until flush with the face of the wall

    7. Fit the cover inserting the thumb screws through the rubber washer then the holes in the cover and screw into Nutcerts on both sides. (DO Not Over Tighten as this may move the nutcert)

    Post Flood Removal

    1. Unscrew the thumb screws and remove complete with rubber washer to both sides of the cover plate.

    2. Clean with water using a mild detergent.

    3. Leave to dry then place cover plate thumb screws and rubber washers in storage

    IMPORTANT! This product must be removed once the threat of flood has subsided to allow normal, free airflow. Failure to remove may result in potential damp issues.

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    BSI Flood Protection Kitemark KM713574
    ISO 9001 Quality Management
    Chas Elite
    Hereford & Worcestershire Chamber of Commerce
    Leaders Council
    Parlimentary Review
    Site by Kingsford

    Flood Checker