The DuraTech 7-8 Class A Chimney Pipe Round Trim Collar for Round Support Box conceals the gap between the Round Ceiling Support Box and the ceiling cutout. Trim collar is painted black.Fuel Type: Coal, Gas, Oil, Wood Inner Diameter: 11-1 8 Material: Galvanized Steel Outer Diameter: 21 Pipe Class: Class A Pipe Shape: Round Style: Functional Trim Collar Thickness: 1 2 UL Listed: Yes Vent Construction: Double Wall Weight: 3.96
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