Improve insulation: This draft cover works to winter weather drafts, keeping unwanted cold air out of your home to heat loss During, this vent cover can be used to keep hot and humid air out This draft blocker ensures your chimney is not a source of unwanted cold or hot air Efficient: This draft vent cover improves energy efficiency thus allowing you to save money on your monthly utility bills Even when there ' s no active, your chimney will continue to generate a draft which can lead to warm air being sucked out of your home and being replaced by colder air from the outside Our blocker acts as the perfect solution to this common nuisance Easy to use: Our draft stopper uses magnets to strongly stick to your ' s vents Simply remove the stopper before using your and reapply it once the cools down and Help allergies: This vent cover is the perfect draft guard to reduce pesky Great for a wood-burning or, our cover for winter and is the perfect companion to your home chimney