Fernco Anti Flood Air Brick

• Product Code: AFAB-TER
• Dimensions: W 210mm x H 62mm x D 73.5mm
• Material: UV-stable polypropylene
• Colour: Terracotta
• Seal Mechanism: Internal self-sealing floating valve
• Standards Compliance:
  
  • BS 493:1995 (ventilation)
  • BS 851188-1 (flood protection)
• Installation: Mortar set with standard tools; can be stacked for multiple courses
• Applications: Residential, heritage properties, listed buildings, and flood-prone areas

This innovative anti-flood air brick offers passive flood protection while maintaining essential sub-floor ventilation. Designed as a direct replacement for standard clay or plastic air bricks, it features a self-sealing floating valve that automatically rises and seals off airflow when floodwaters approach, preventing water ingress without the need for any manual activation. Once floodwaters recede, the valve reopens to allow airflow to resume. Its discreet design, BSI Kitemark certification, and compliance with BS 493:1995 make it suitable for both new and existing properties, including heritage and listed buildings.

• Automatically seals against rising floodwater using a self-activated floating valve
• Maintains sub-floor ventilation in line with BS 493:1995
• BSI Kitemark Certified to BS 851188-1 for flood defence products
• Straight replacement for standard air bricks – no special fittings required
• Removable front grille for easy inspection and maintenance
• Integrated mesh blocks insects and debris
• Suitable for single, double, or triple aperture installations
• Passive operation – no manual intervention needed
• Compatible with both modern and traditional property tyes
• Available in terracotta to blend seamlessly with brickwork

Important: This product must be installed with care to ensure a watertight barrier is achieved. Faultless pointing is essential to prevent water ingress into the property’s foundations. Always install the product with the grille upright and the valve correctly oriented.

 
Tools & Materials Required

• Screwdriver
• Soft brush
• Hack saw (for double/triple aperture installations)
• Mixing bucket (for mortar)
• Sand, cement, and PVA bonding agent
• Trowel or pointing tool
• PPE (gloves, eye protection)

Installation Steps

1. Prepare the Unit
   • Unscrew and remove the front grille.
   • Take out the red locking tab and installation leaflet from the valve.
   • Refit the grille before starting installation.
   • Do not remove the protective film from the face until final step.
2. Remove the Existing Air Brick
   • Cut out mortar surrounding the current air brick.
   • Carefully extract the unit, ensuring not to damage surrounding brickwork.
   • Brush the cavity clean to remove all debris and mortar remnants.
3. Prepare the Mortar & Opening
   • Mix a mortar of sand, cement, and PVA.
   • Lightly wet the aperture to help mortar adhesion.
   • Ensure the aperture is clear and matches the dimensions of the Anti-Flood Air Brick.
4. Fit the Anti-Flood Air Brick
   • Position the brick upright with the spacers at the bottom.
   • Insert into the aperture and bed in mortar evenly around all sides.
   • Use the 8mm lip on the rear of the unit to guide correct mortar depth.
   • Point around carefully, ensuring a complete seal and flush finish with wall.
5. Finalise Installation
   • Once the mortar has cured, remove the front protective film to expose the grille.
   • The installation is now complete

Additional Guidance for Multi-Brick Installations

• For double or triple replacements, stack 2 or 3 Anti-Flood Air Bricks vertically.
• Align with mortar joints for proper fit.
• Use a hack saw to remove the rear lip of the upper brick(s) to ensure a flush finish.
• Point around all units as a single system for seamless integration.

Post-Installation Checks

• Confirm unit is level and mortar is evenly set.
• Check that grille is secure and removable for maintenance.
• Test that no visible gaps or loose mortar exist around the brick.