Enjoy effortless pest control with our MouseMesh® Stainless Steel Air Brick Covers. Crafted entirely from stainless steel, these covers provide a strong and functional solution for rat infestations. The 2mm woven stainless steel mesh restricts entry of rodents and insects larger than 4mm via air bricks. The Air Brick Covers come with clear fitting instructions and can be installed over intact or damaged air bricks without disrupting air flow. A lasting, cost-effective, and humane pest-proofing solution. Helping to reduce the use of Snap Traps & Poisons. IMPORTANT: Do not use MouseMesh® Covers to ventilate gas appliances. Accumulated dust, leaves, or dirt can block airflow, risking carbon monoxide poisoning.