- ENERGY SAVINGS: Effectively prevents drafts, odors, and debris from entering your home through a fireplace or wood stove. In winter, it minimizes heat loss, keeps your space warm, and lowers heating costs. In summer, it retains cool air and blocks outside heat, enhancing air conditioner efficiency. - BUILT-IN TWELVE POWERFUL MAGNETS: Features twelve strong magnets, each with a suction force of 1.2 T, ensuring secure attachment to your fireplace’s metal frame. The black color blends seamlessly with your fireplace, making it unobtrusive. Note: Avoid high-temperature environments to maintain magnet strength. - MATERIAL AND DESIGN: Crafted from thickened flame-retardant oxford cloth and filled with sponge for insulation. A unique split line design keeps the inner lining in place, while robust magnets ensure a tight fit to block external cold or hot air. - INSTALLATION & STORAGE: Simply place the magnet side of the blanket against your fireplace’s iron frame, and it will automatically adhere—providing a secure, flat fit without falling off. Lightweight and foldable for easy storage when not in use. - SIZE OPTIONS: Available in various sizes: 30x30, 33x29, 35x37, 36x24, 36x27, 36x30, 36x32, 38x26, 38x28, 38x31, 39x32, 41x29, 42x32, 43x36, 45x34, 46x35, and 51x39 inches. Each cover includes built-in magnets and an installation manual. - USAGE TIPS: For optimal performance, use after the fire has been extinguished. The cover is vacuum packed; for best results, unpack and hang in a ventilated area for 24 hours before use to allow it to regain its normal thickness. This product is compatible with metal fireplace frames containing iron, cobalt, and nickel, ensuring effective thermal insulation for your home.