<br>Useful vent cover: <br>Avoid those unwanted birds, mice, snakes or other critters getting into your dryer vents nor exhaust vents. <br> <br>Hexagonal grid size: <br>Hole diameter is from 8 mm to 10 mm, proper size ensure that there is more than enough space for the vent to function properly and safely. <br> <br>Sturdy material: <br>Made of quality aluminum alloy material, durable, waterproof, rust proof and easily cutting. <br> <br>How to install: <br>1. Use scissors to trim the aluminum alloy grill to appropriate size for louver vent hood cover guard. <br>2. Remove three to four louvers at the bottom of the vent. <br>3. Slide into place in the housing. <br>4. You have now successfully found a beautiful and efficient way to stop birds, mice, snakes, and more from making a home in your dryer vents and exhaust vents. <br>5. Easily remove and reinstall for periodic cleaning. <br> <br>Note: <br>1. The plastic louvered vent cover NOT INCLUDED. <br>2. Additionally, we recommend to clean the vent every 4 to 6 months for better results. <br>3. If you use 4 inch vent hood, you can trim this vent hood cover guard up to 8 pieces. <br> <br>Package includes: <br>2 x Aluminum alloy grills