The Montigo Heat Guard is a handy accessory that helps transfer heat away from your vented fireplace. Designed for use with Montigo venting, it fits 4-inch ID, 7-inch OD and, 5-inch ID, 8-inch OD venting, making it compatible with a wide range of systems. The heat guard is crafted from durable materials, ensuring it can withstand the heat without any problems. So, you can enjoy the warmth of your fireplace with peace of mind, knowing that the heat is being safely transferred away from your home.