The MouseMesh® PestBrick is constructed in two sections to seamlessly replace bricks during brick laying. This robust, durable product is available in a variety of colours and boasts a sturdy cover that easily slides onto the air brick. Just like a conventional air brick, it is embedded into the wall using mortar. Our PestBrick stands out with unique interlocking spacers that maintain the necessary cement line gap between air bricks, allowing for perfect incorporation into the brickwork. IMPORTANT: Do not use MouseMesh® grills to cover vents for gas appliances. Dust, leaves, or other debris may block airflow, posing a serious risk of carbon monoxide poisoning.