(KMOV) -- A new warning is out for the man behind two News 4 investigations into air duct cleaning companies.
In 2012, the crews from US Air Ducts ran away when News 4’s Chris Nagus started asking questions.
Then this past year, News 4 conducted an undercover investigation of Pure Air.
The same man, Noach Palatnick, was behind both companies.
Now the Better Business Bureau warns he is also connected to Air Care and Show Me Air Duct and Carpet Cleaning.
Watch out for robo-calls from Air Care that is offering a discount for air duct cleaning services.
St. Louis residents warn that when the crews show up, the bill goes up from the promised price too.