Will fit a double flue chimney with one 8"x 8" and one 8"x 13" flue inline with a space not greater than a 3" between them or overall flue sizes ranging from 6"x 21" to 9.5"x 24". Stainless Steel Lifetime Warranty. Availability: Usually ships the same business day. 300822Regular price: $154.95Sale price: Copyright © 2008 Chimney Depot Inc. All rights reserved.