I'm wondering how many here think ammonia will someday be used as a primary refrigerant in grocery stores? Obviously not for a direct x system, but as a primary to cool some secondary like glycol, co2, or some other secondary refrigerant. I just read an article that it's being "re-classified" and that re classification may make it available for commercial ref in the future. The article was very pro nh3, saying that the primary charge of ammonia at a typical grocery store presented very little threat to public safety due to the (relatively) small amount of ammonia present.