this video is misleading, as it shows fresh air with red color, and return air with blue color, it's absolutely wrong, fact it should be vice-versa (I'm HVAC technician for 10 years)
@@AMJEngineering it can be anything and that's fine, and what I mean is, people generally perceive Red color as a symbol of HOTness and blue color as a symbol of COLDness, it's generally accepted everywhere (ask anyone or prove me wrong) (P.S/ professionally you might be right, but I'm sure 95% of viewers of this video aren't professionals)