The National Association of Duct Cleaners of America NADCA, issued a ban on the use of chemical sanitizers in air duct systems. The reason is that the way involved fogging in a chemical directly into the ducts, there was no way to completely sanitize the air ducts or ensure that the product was delivered along the length of the insides of the duct.
For that reason No More Odor offers HVAC sanitation service either with a ozone treatment or by it self. It is highly recommended that home owners here in Florida have their HVAC system sanitize a minimum of once to twice a year due to the high humidity here in Florida.