Manual Rectangular Duct Damper is a key part of an efficient HVAC (Heating, Ventilation, and Air Conditioning) system that is designed to regulate and control the air flow within an enclosed environment. This simple but versatile device consists of a metal plate which can be manually moved – either by hand or motorised – allowing the user to accurately adjust the amount of air passing through a duct in order to achieve their desired level of comfort. When one wants to close the damper, it helps to passively reduce noise levels while also reducing the load on a building’s HVAC system. It can even provide additional energy-saving benefits if used properly. With these functions, the Manual Rectangular Duct Damper is an essential tool for anyone looking to keep their living or working spaces comfortable and energy-efficient.