Great explanation, but you must also consider the NFVA of any baffles placed under the roof at each soffit vent. They're often under 25 sq in when a vent sheet is fully used between 24" rafter spacing. If you're forced to use a half sheet of baffle due to tighter rafter spacing (such as 16"), then you are REALLY restricting the NFVA. In other words, if you're going to use baffles, you may have to significantly increase the number of soffit openings used, and there's no need to use large soffit vents as the baffles will be restricting the flow, anyway.

Just what I needed to 'attempt' to correct my hot attic in my 66 year old home. Thanks!

This video is like having to take algebra during the summer😄😁😆

Great Information.! I am currently building a new home and would like to make sure adequate ventilation is in place as ive had issues in the past. I am confused as to exactly what are should be used for the calculation though. Is it the total area of the House "Under Roof" (House, Porch, garage, lanai etc) OR is it only the areas above the air conditioned space? Thanks!

Good video, thank you.

I'm having a lot of trouble figuring out what the NFV should be here in Denver, any idea? Also, should intakes ideally be on multiple sides, two, one?

Can I use a SSB960 as intake near the bottom of the roof?

Sorry - I could not make it all the way thru the video... The music became too annoying. If I ever need this info I can watch with MUTE ON... Thanks anyway...