Oh I forgot...the 2nd and 1st guy said that it might be necessary to put glue...then metal tape...then mastic sealant along the edges of the vents to seal them better....to keep them from pulling in particles from attic...along with putting expanding foam in receptacles and plugs. Then do can lights to seal them.
comfortcontrolac...what is that rating in seer instead of ton? I might not be asking that question correctly. Also...what is the name of that fresh air intake? I've looked on websites and can't seem to track down what you are talking about.