Excellency is in the details and that is why you invest in only the best when you purchase any empire product. This specific empire fresh air kit is designed to improve your fireplaces efficiency and use like no other product available. This design is specially created to be used with breckenridge deluxe fireboxes and premium vent-free fireboxes, keystone deluxe b-vent fireplaces, and keystone premium b-vent fireplaces. Your time and resources are important, and that is why empire strives to create products that you will enjoy for years to come. 7 lbs weight.