The BigTop 14 in. x 21 in. Stainless Steel Hinged Multi-Flue Chimney Cover by Hy-C Company is on sale. Buy now while the incredible deal is available! There won't be a better time than now to buy the BigTop 14 in. x 21 in. Stainless Steel Hinged Multi-Flue Chimney Cover by Hy-C Company.