i don't know where to post this so mods or admins can repost to whatever section is best fit. in my thermo class we were learning about the refrigerator and as soon as the prof said the working substance was CFC i remembered back to my high school chemistry days when my high school chem teacher told us that CFC was banned for Ozone depletion. and apparently freon is still used everywhere. i did a little "research" and all i was able to find was that CFC is actually a class of chemicals, one of which happens to be freon. but i thought ALL CFC's were banned. why is freon still in use then? is freon a paticular CFC that has no effect on the ozone?