Okeedoke. Suck Or Blow..Nyuk! 1) In the old day's..I was told.."Push The Air Through The Hoods".(Blow) That is to say..the Fans are set to "Push Air Through And Out" and thus a series of filters becomes necessary etc..etc...sigh...etc.. I now believe...this is questionable/debatable. I believe the Old Wisdom for this..was "Scent and Security Issues"..as opposed to straight-up "Efficiency". 2) Out of basic necessity of "Events"..I've recently set up a "Suck" System with Hoods (Reflectors) simply "Sealed" at one end. (Scent/Security is not an issue 'round here.) Hood Surface Temperatures are.....vague..thus proving little. That is to say..temperatures taken and 'felt' on the Hood's..for both the "Blow Line" and the "Suck Line" seem..basically..Equivalent. Measuring "Fan Stress" and the rest of the Field of potential measurements well..perhaps I can obtain answers here instead of bringing in MIT? Before I do..ALL Hoods this way (And I am debating this 'internally' for the simple reason that I could literally Eliminate an entire "Network" of Ducting and Filters with a "Full Scale Suck/Pull System") I am wondering if any of you "Big Brains" out there..have any Real "Physics" or other "Certainties" which I might utilize to make the correct decision regarding this issue. Here are the Issues I hope to address..or that are important to..well..me personally in this decision: 1) Heat (Always, and I'll literally take a "Degree or two" as "Enough Of A Reason") 2) Equipment Fatigue. 3) General Efficiency. Any SOLID information/Ideas are greatly appreciated.