The Air Brick 215x215mm Square Hole is a high-capacity, heavy-duty ventilation component designed to provide maximum sub-floor and wall cavity airflow in extensive masonry construction. Manufactured from tough, weather-resistant material, this large-format air brick is engineered to withstand severe environmental exposure, UV degradation, and rigorous weather conditions while maintaining long-term structural reliability.
 
Featuring a robust square-hole grid pattern, the vent delivers an exceptionally generous free-air cross-sectional area to promote continuous, high-volume air circulation beneath large floor spans and within deep structural cavities. Its substantial 215mm x 215mm dimensions correspond to a standard square brick layout, allowing for seamless integration into larger masonry openings and commercial or multi-story residential builds without the need for complex custom cutting.
 
Essential for preventing severe dampness, interstitial condensation, and timber rot in large building footprints, this square-hole air brick ensures optimal ventilation compliance and moisture control. Whether you are managing a major new construction project, ventilating extensive sub-floor spaces, or upgrading high-capacity airflow systems, this component delivers professional-grade performance and enduring durability.
 
Features & benefits
 
Resistant to frost
Resistant to colour fading
Allows air movement to reduce condensation build up
Holes sized to prevent vermin entry
Weathers well with surrounding brickwork