Closure plates or better known as "register plates" in the trade are the plate that seals the bottom of a chimney when connecting an appliance to the chimney allowing for a chimney liner to be installed and to stop heat loss up the chimney. We manufacture register plates using 1 mm galvanised sheet steel, we can supply a flat sheet or with the edges turned down to allow for fixing. Register plates can be pre-drilled making the installation simple and we can install access panels for future chimney inspection if required. Enter the required details and dimensions in mm in the form below to calculate the costs. Please allow for a 5 mm tolerance to all sides.