Lyemance 9″ x 13″ Damper Cap Just what you have been waiting for, a cap that will fit over a Lyemance damper. No more swapping out dampers for a damper/cap combo product. Now you can simply just add a cap to any damper. It’s simple, it’s easy. Don’t forget to sell a damper cap to your existing customers who own dampers the next time you clean their chimney. Features: Material: 304-alloy stainless steel. Lifetime Warranty. 24-ga. lid; 18-ga. frame. 3/4″ mesh. Specifications: Overall Dimensions: 13″ (W) x 9″ (D).