Just bought a house last february. As soon as we moved I started having major sinus issues. So in April we had an air quality test done....everything except carbon monoxide came back high...high particles...high co2...high humidity high 50s low 60s..high chemicals etc. So at first I thought I had a tight house and was considering a whole home dehumidifer...then a recent trip through my attic revealed something to me...I dont think I have enough ventilation....I have about 2500 sq ft of attic space...there are soffit vents but they are blocked by the vaulted ceilings at every other rafter...with every other rafter having baffles...ive heard and read the soffit baffles should be at every rafter...the attic right now is about 10-15degrees more than outside...during the summer is probably at least 20-30 degrees hotter...summer is much worse on my sinuses and the dust in the house is worse witb there being an atticy smell...about two thirds of my attic space have the baffles like this or less...also I only have two of those mushroom vent things at the highest part of my roof...but I dont think these are even half of the 900 plus sq in of exhaust I need. I did a caculation and realized that the builder seemed to be using 1/300 ratio for the calculation....I read that newer homes...the house was built in 2007 should use the 1/150 ration to calculate the amount of exhaust/ intake. So it seems I need at least twice as much ventilation....my house has a center section that is like a 4 sided pyramid...with two gable roofs coming off of this section in the front and a gable section in the back for the master bedroom...so I can't use ridge venting in the main part of the house...was thinking of putting three 14 inch turbines at the top of the main section and one turbine for each of the gable sections....this has been a big deal since this whole lack of ventilation thing seems to really be affecting the air quality in the house. Any ideas...ive been wondering why older houses that have similar square footage and two turbines seem to feel better to me. I think I have found an answer.