Gelco; Gelco 13″ x 21″ Stainless Steel Single-Flue Chimney Cap 5/8″ Mesh; 13317 Gelco’s single-flue caps are available in 3/4 rugged mesh. Some sizes are available in 5/8 (California) mesh. Gelco’s signature cross-braced lid and deep double channel base give it superior strength so you know your customer is getting the best chimney cap on the market. for the customer with budget in mind, you can’t go wrong with the galvanized painted black model. Features: Material: 304-alloy stainless steel. 18-ga. base and mesh, 24-ga. lid. Lifetime Warranty for stainless steel. Lifetime Warranty on workmanship and materials. Specifications: Overall Dimensions: 21 (W) x 13 (D) x 8 (H). Fits Outside Dimensions: 11X16-1/2 to 13-1/2X18-1/2. Mesh: 5/8.