Your search for "maintenance kit 3300 includes fire rope" revealed the following:

Product Description Central Boiler Outdoor Wood Furnace Door Kit: includes 1x10 Oz. tube of RTV Black Silicone and 10 feet of braided fiberglass door seal rope.   Typical Applications Wood boilers and furnaces Features 1x10 Oz. tube of RTV Silicone, black...

Product Description 1" Fire Rope to Seal most Outside Wood Furnaces Doors. Outdoor wood boiler fire rope, wood boiler door rope, Fiberglass Rope for Fire door, Stove Door Sealing Rope, knitted fiberglass rope, Fiberglass rope lagging, knit-braided fiberglass rope, fiberglass...