Enhanced Insulation: This magnetic fireplace draft shield eliminates drafts during winter weather, preventing unwanted cold air from entering your home and preventing heat loss. In the summer, this fireplace draft shield can be used to keep warm, humid air out. This fireplace draft shield helps prevent your fireplace from becoming a source of unwanted cold or hot air. Efficient: This draft shield increases energy efficiency and saves you money on your monthly electricity bills. Even when there is no fire burning, your fireplace continues to produce drafts that can cause warm air to be pulled out of your home and replaced with cold air outside. Our chimney blockers are the perfect solution to this common problem. Helps with Allergies: This magnetic vent hood is the perfect wind blocker to reduce annoying and unwanted pollen and dust from entering your home through the chimney. Perfect for wood or gas fireplaces, our winter and summer chimneys are the perfect companion for your home fireplace. Simple to Use: Our chimney vents adhere securely to the magnetic chimney vents using magnets. Simply remove the plug from the mapper before using the chimney and reapply it once the chimney has cooled. Plus, our wind blocks can easily be trimmed with scissors to better fit the vent openings of your specific chimney.