The answer to 'types of ductwork' is that there are several common types of ductwork used in HVAC systems. The most common are round, rectangular, and flexible ductwork. Round ductwork is circular in shape and is often used for small, straight runs. Rectangular ductwork is square or rectangular and is used for larger, more complex runs. Flexible ductwork is made of a metal coil covered in insulation and is used to connect the main ductwork to individual vents and registers.
The type of ductwork used depends on the size and layout of the home, as well as the specific HVAC system requirements. Proper ductwork design and installation is critical for ensuring efficient and effective heating and cooling. If you are unsure about the best ductwork for your home, it's best to consult with a professional HVAC technician.