They installed a Green Air which is a UV light that super cleans the air as it comes out of my a/c system and goes into the house. They cleaned my grills, the vent covers, so they looked like new. I had recently purchased this home and I do not think the ducts and vents were cleaned in a long time. I am guessing 50 years from the looks of the grime and dirt here. I am very pleased and would only want David Leisure, Brandan and Freddie to return. They could not have been nicer and more professional. I totally recommend The Duct Specialists for future work. This company has hired great people. Thank you James and Sherry, you have hired some great employees! Love Brandon and Freddie