Flame Repel, class A Fire-rated products, resist the spread of fire while exceeding both the California and WUI Fire Ratings. Flame Repel wood is treated with an environmentally safe, non-toxic formula, and pressure treated for fire resistance through the product’s useful life. The treatment process utilizes safe amounts of energy and water, and all the chemicals are recycled. All Class A fire-resistant wood products must undergo accelerated weathering tests to ensure the durability of the treated exterior.