The FBI is warning people to be on alert for refrigerant substitutes that have not been approved by the Environmental Protection Agency.
Some contain propane, which is flammable and can explode. The phaseout of R-22 has increased the demand for cheaper, unapproved replacements, many of which are made in China and sold on the black market. Products like “Super Freeze 22a” have been selling mostly online or over the telephone to home owners and “do-it-yourselfers,” circumventing stores and regulators, the FBI said on its website.
The FBI has launched an investigation into the sale of unapproved refrigerants but declined to answer questions from The Associated Press.
It is unclear how many people may have fallen victim to a refrigerant scam. Reports of fires or explosions seem rare.
The EPA, without citing specific examples, said it knows of cases in the U.S. and abroad where people have been injured after using unapproved refrigerants in air conditioners.
Additionally, the agency took action against at least one U.S. company in 2013 for selling an unapproved refrigerant that had the potential to explode.
There have been scattered reports of deaths overseas.
A New Zealand firefighter was killed and seven others were seriously injured in a 2008 explosion blamed on a propane-based gas being used to cool a refrigeration warehouse, according to local media reports at the time.
More recently, dock workers in Vietnam and Brazil were killed after giant shipping containers exploded when suspected counterfeit refrigerant was placed in their cooling units, according to shipping reports obtained by the U.N. Environment Programme.