I just bought some 2nd hand Fafco panels that are only a couple years old and half of them brand new never installed. I just spoke to an installer and was told that I can't use these panels on my tile roof and he recommended that I get the newer panels that have separated tubing that doesn't act like a windsail. While the logic is correct, this is all news to me. Can anyone confirm or deny this? Are there ways to remedy this? I'm sure there's a way to install this because I've seen them on tile roof before.