5" DuraVent DirectVent Pro Wall Firestop - 58DVA-WFS
This wall firestop is designed for horizontal (through-wall) installations to help reduce chances of a fire. Refer to the appliance manufacturer's installation instructions for requirements.
WARNING: Carcinogens: This product can expose you to chemicals including Lead, which is [are] known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.