The attic insulation shield is required for installations that pass through an attic to prevent insulation and debris from accumulating near the vent. Provides 1 clearance to combustibles.ADA Compliant: No Depth: 9-1 5 Finish: Galvanized Fuel Type: Gas, Liquid Propane Height: 11 - 20 Material: Aluminum, Galvanized Steel Pipe Class: Direct Vent Pipe Inside Diameter: 4 x 6-5 8 Pipe Shape: Round Style: Contemporary Modern UL Listed: Yes Weight: 5 Width: 9-1 5