This removable base cap includes a built-in fresh air wind guard and exhaust wind guard, ensuring that debris and water don't get into your chimney. It also features an 18" × 18" top plate, and a hose clamp for an extra-secure fit. It has a 4" Exhaust and 3" Air Intake for smooth airflow.
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.