The Hepworth Terracotta Square Hole Airbrick in Red has dimensions of approx. 215 x 65 x 50mm (W x H x D). It is manufactured from Vitrified Clay and is used to provide natural air ventilation in roof and floor voids. It has a free air space of 1300mm2 and is suitable for new build and refurbishment projects. Terracotta airbricks complement the external finish of a property and weather in well with the surrounding brickwork. They are resistant to fading and frost.