Single-wall (or single-flue) chimney caps are standard chimney caps that are designed for single-wall metal chimneys (chimneys that are made up entirely of a rigid metal tube).
Unlike chimney caps that bolt directly to the flue or chimney crown, these single-wall chimney caps slip right inside the flue’s opening (the interior pipe). To ensure a proper fit, measure the inside diameter of both the center pipe and the outside pipe.
If your home has a single-wall or solid-pack metal chimney, a single-wall chimney cap is a great choice to prevent water penetration, keep animals and debris out, and protect from damage.
These chimney caps are meant for single-wall / solid-pack chimneys only.
To get the correct size, measure the inside diameter of the center pipe and the outside!