From Around The Web: 20 Fabulous Infographics About Commercial Air Duct Cleaning Popular Service
https://milkyway.cs.rpi.edu/milkyway/show_user.php?userid=2472241
2. First, take away the vent covers from the wall space or ceilings. Take care not to damage the vents or duct function when removing. If there is color build-up on the vents you can use a putty knife (run around