Will fit a double flue chimney with one 8"x 13" and one 13"x 13" flue inline or with a offset of not more than 4". The space between the flues can not be greater than a 3". Also will fit a range of flue sizes from 11"x 21" to 14"x 24". Stainless Steel Lifetime Warranty. Availability: Usually ships the same business day. 301324Regular price: $207.95Sale price: Copyright © 2008 Chimney Depot Inc. All rights reserved.