How to Choose the Right Outdoor Vent Cover for Your Home If you're looking for an alternative to Styrofoam vent inserts, then Vanity Vents is the perfect option for you. Vanity Vents are made from high-quality, durable synthetic materials that offer a high performance alternative to unsightly, messy, crumbly and dangerous Styrofoam vent inserts. They're also easy to install - just attach them to your exterior wall using the built-in hanger and they'll protect your property from rain and weather damage. And because they're made from synthetic materials, Vanity outdoor vent covers are eco-friendly as well!