Fire Resistant .. Magnetic Fireplace Vent Cover: Our revolutionary fireplace draft blocker is made from a fire—resistant carbon fiber material that also reduces heat loss from your home. This gas fireplace cover adheres to the exterior of your fireplace screen following a wood burning fire experience..Saves Energy & Money: The fireplace screen cover is , conserves energy, and most importantly saves money by reducing the heat loss that escapes up your chimney after a wood-burning fire. Our chimney draft stopper comes in 4 sizes: Small 30" x 36" - Medium 32" x 42" - Large 36" x 48" – X-Large 48" – 55". Protects Home From Fires: The other major benefit of our fireplace insulation cover is protecting hot embers from making their way inside the home which can cause fires. Our fireplace blanket can give you peace of mind while you sleep!. When To Use: Our black fireplace cover should only be used when your fire has reduced down to hot coals and embers. Never use this fireplace draft blanket when you have open flames or burning logs. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store