Rigid duct accessories provide users with tools to install ducts more efficiently, provide additional functionality, or increase HVAC system efficiency and performance. Duct access doors provide access to the duct interior for maintenance and inspection. Blast gates block or allow air to pass through the connected ducts. Vent boot hangers and duct transitions connect ducts with grilles, registers, and diffusers. Duct insulation pads and rolls install onto HVAC ducts and reduce the heat transferred to and from the surrounding space. Duct installation accessories help users connect ducts and install them on their mounting surfaces.