SIZE & COMPATIBILITY - The size of the top ceiling box is 12" X 12" X 8" and it is compatible with duct 8". Made in the USA
APPLICATIONS - The C-Box Duct with Drywall Flange, Round-connects To Vent Register Diffuser, Airflow Conditioning Ceiling Registers
PREMIUM QUALITY - Our Galvanized Duct Box is made of high-quality 26-Gauge galvanized sheet metal with crimped ends (snap-lock design) for easy fitting and secure connection
PRACTICAL DESIGN - The ceiling box is the best way to regulate airflow is to install a manual volume damper in the duct run, all the way around the square portion which can be used for attachment or folded over