Have you ever seen that sticker on something you own that makes reference to Proposition 65? What does it mean anyway? Video Script: The question comes from Felicia. "Hey Dan, is the Proposition 65 label on some products related to circulating air or jus the physical container if you touch it? How would one be exposed to lead?" Proposition 65 is a California law that requires a warning label for any products with a cancer-causing substance. It could be anything. For example: Was this made in a facility with lead in it? Or is there lead in the control board? It's really strict. She is specifically asking about a ductless heat pump. So, in this unit, so to answer your question, no. There's not going to be any lead circulating in the air. There is no danger of lead when you touch it. The only way you're going to get lead is if you break open the unit, rip out the control board and you eat it. But barring you becoming someone who eats metal, I think you would be OK. Have more questions? Just ask them in the comments below or on Facebook or on Twitter.