The Weathershield Stainless Steel Chimney Cap helps maintain a chimney's optimum performance by keeping out rain, snow, leaves, debris, squirrels, birds and other animals. An added feature is the removable mesh screen that provides a measure of safety by helping to contain sparks. It also has a 100% stainless steel construction that assures long life and performance. This model is designed for round chimneys and has a 1" x 1" stainless steel screen mesh. This component works with the following types of chimneys: Single Wall, Masonry, Solid Pack Insulated, Class A, and B vent.