The 8" DuraTech Square Ceiling Support Box is an essential component for ensuring a safe and efficient chimney system installation. This support box is designed to provide a secure connection between your chimney pipe and ceiling, featuring a reliable built-in twist lock that simplifies the setup. It is versatile, compatible with both flat and cathedral ceilings, and can also be used in short attic spaces. The support box is designed for appliances tested for use with a 2100°F HT chimney system, including wood stoves, fireplaces, boilers, and more. Its robust construction allows it to fit between 16" on-center joists, supporting up to 60 feet of DuraTech Chimney, making it suitable for most mobile home applications. The included 2" wide trim collar adds a finishing touch to the installation, ensuring a professional look.