Hot rod Harley ,I have lots of formal education, and practical hands on , In HVAC/R ,but the ones that apply here are SMWIA , Skecher/Ductwork design) CAD, also SMWIA Cert in AIr balancing and testing. all of my work is in building trades . extensive design stuff for big Pharma Co. like Novartis, Roach, shering plough , Phizer, lots of Hood work in the big Pharmas, but the other half of my work is in large corp new constuction , lots of financial building ,like Jp morgan , Goldman Sachs,Merril lynch , USB , nothing under 30 storys high. Retired because got sick from 9/11 just found out recentlythat cannabis gives me real good relief thats why Im here to learn to grow meds. Never really talk about this but this might be Good for me , I was there that day about 1500 ft away working on a new building ,Stayed and cut iron for about 1 an half days they needed guy who had oxy/accet cutting exp,anyhow after the day n a half got booted by the FDNY,no prob there saw enough, heard enough and felt enough,So any how the Sheet meatla co ,I was workling for got the bid on 3 metro north line tunnels that crossed under the hudson river from Jersey Cite NJ to the grand concorse in the WTC ,see all the water used on the rubble flooded a lot of train tunnnels it was a main hub area, anyhow these 3 tunnels were pumped out for weeks then I had 16 man crew to get in ther and install temp exhaust and fresh air supply to ,So other tradesmen and myself and my crew can begin work to get these tunnels up and running again, So you see moving air is in my blood and I really do know what im talking about .