You guys seem to discuss negative house pressure, outside air kits, occasionally, so I wonder, if you want, you could check the post I just made on the Hearth Room. If not, then thanks anyway. 
https://www.hearth.com/talk/threads/negative-pressure-in-house-esp-basement.101069/
https://www.hearth.com/talk/threads/negative-pressure-in-house-esp-basement.101069/
