2Piece Magnetic Fireplace Draft Blocker Set Draft blocker covers and dimensions: includes two black covers sized 91.44 x 10.16 cm and 101.6 x 10.16 cm. They attach to metal fireplace vents using strong integrated magnets and can be trimmed with scissors for a custom fit to forestall cold drafts in winter or hot, humid air in summer. Clear energy efficiency benefit: magnetic rubber material forms an airtight seal over chimney openings to reduce heat loss and lower heating and cooling costs. This vent cover helps maintain indoor temperatures by minimizing unwanted airflow through unused fireplaces yearround. Allergy and cleanerair advantage: acts as a windscreen to block dust, pollen, and outdoor substances from entering your living space through the fireplace opening. Suitable for both woodburning and gas fireplaces to support cleaner indoor air quality. Easy installation and reuse: attaches instantly with no tools or adhesives and is securely held in place by magnetic force. Remove before lighting a fire and reapply once the unit has cooled. Reusable design supports long lasting performance with proper care. Use scenarios Winter comfort: seal an unused fireplace to prevent cold drafts and heat loss, helping maintain a steady indoor temperature. Summer relief: block hot outdoor air and humidity from entering through the fireplace when not in use, improving comfort and reducing cooling load. Allergyconscious spaces: reduce entry of dust and pollen through the fireplace opening, supporting cleaner indoor air for households with sensitivities.