Quote Originally Posted by Jultzya View Post
I agree, I would believe my eyes FIRST.

I'm also pretty sure Carrier/ICP doesn't use it during manufacturing either.
Lennox Does. I used to take people on tours of the factory myself when I worked there, and I pointed it out. Some of the assembly stations have a small nitrogen hose that is very discreet, you might not see it unless you know what you are looking for.