Effortless pest control is here with MouseMesh® Air Brick Covers! Our 2mm stainless steel mesh halts rodents and insects larger than 4mm from entering through air bricks. Comes with easy-to-follow instructions for simple fitting. Can be installed over any air brick, damaged or not, without disrupting air flow. A cost-effective, enduring, and humane solution for pest prevention. Note: MouseMesh® Air Brick Covers should not be applied to vents associated with gas appliances. Mesh blockage by dust, leaves, etc. could inhibit air flow and elevate the risk of carbon monoxide poisoning.