1st time post, long time browser. I am an apprentice for a company that does it all (hvac, refrigeration, electrical, appliances, plumbing, geo-thermal) and have been looking for a place in the company to make an impact in. I feel that the air distribution system is just that, as this company is focused more on equipment than on perfecting a "system". Yes, I am fresh out of a trade school, but want the important fundamentals of this trade embedded in my training. That said, I was taught that an hvac system is only as good as it's air distribution system and I want to focus my "free time learning" on this particular aspect. So... What do YOU consider to be the most important aspects to understand about the air distribution system aside from the metal fab itself (i.e. balancing, calculating, etc.)? Thanks in advance.