The DirectVent Pro 5 x 8 Inner Diameter Galvanized Ceiling Firestop is a component that is used in a typical venting installation. A ceiling fire stop is required for multi-story vertical installations at the second floor and any subsequent floors.ADA Compliant: No Depth: 12-1 2 Finish: Galvanized Fuel Type: Gas, Liquid Propane Material: Aluminum, Galvanized Steel Pipe Class: Direct Vent Pipe Inside Diameter: 5 x 8 Pipe Shape: Round Style: Contemporary Modern UL Listed: Yes Weight: 4 Width: 12-1 2