EASY-TO-INSTALL -Dryer vent closure with hassle-free installation. VENTILATION - Lets warm air escape when open. KEEPS COLD OUT -Prevents cold air from entering when closed. NO PESTS - Prevents insects and pests from entering through dryer vent. VERTICAL INSTALLATION- Vent must be installed vertically and sliding may need to cut for proper installation. Replace your old vent with the Heartland Natural Vent. This easy-to-install dryer vent closure features a square base with pre-drilled holes for your convenience. The Heartland Natural Vent will last throughout all seasons, letting warm air escape when open and preventing cold air from entering when closed. Additionally, this vent will provide critter protection, keeping insects and other pests from entering your home through the dryer vent. Looking for some savings? This energy saving dryer vent closure is designed to get the job done effectively and efficiently. Do your wallet a favor with the Heartland Natural Vent.