To riterate for the 100th time! All alternative refrigerants are either flammable or a blend. R406a is a blend. The problems with blends are; the components leak at different rates requiring COMPLETE removal in the case of a minor leak instead of topping off, also they have trouble circulating lubricants to keep your compressor alive.

Additionally for the 100th time, each one of these alternative refrigerants are supposed to be recovered just like 12 or 134. Have you ever seen a recovery machine setup for anything other than 134 or 12? I haven't. These machines are expensive and no one is going to have one set up for every possible refrigerant, plus the EPA does not allow machines to be changed around. The EPA also requires fittings specific to the refrigerant. Have you ever seen any 406a fittings? I haven't and probably never will.

For the life of me, I can't understand the fixation people have that keep them from buying a refrigerant (R12) because it costs $15 per pound. People routinely spend HUNDRED$ of dollars to convert so that they can save maybe $30 on refrigerant. I guess there are just that many people that flunked third grade math.

Have a great day,