The DuraTech 5 Class A Chimney Pipe Attic Insulation Shield is required for installations that pass through an attic to prevent insulation and debris from accumulating near the chimney. Fits over Firestop Radiation Shield or a support box. Consists of two parts – a collar and a base. Adjustable length.ADA Compliant: No Collection: DuraTech Fuel Type: Coal, Gas, Oil, Wood Height: 13 Material: Galvanized Steel Pipe Class: Class A Pipe Inside Diameter: 5 Pipe Shape: Round Style: Functional UL Listed: Yes Vent Construction: Double Wall Weight: 4.8