Hepworth Terracotta airbricks allow the free movement of air to ventilate buildings. Terracotta airbricks can complement the external finish of a property and will weather well with the surrounding brickwork. Free air space 2890mm2 Suitable for new build and refurbishment projects Red colour resistant to fading Resistant to frost and the freeze/thaw cycle. Clay Air Bricks Red are used to ensure air circulation between floors and cavity. This airflow prevents the intrusion of damp and rot within internal "voids" and gives your projects added protection. Resistant to the effects of the "Thaw-Freeze" cycle the bricks avoid the damage this often causes materials.