In all houses, but especially in an airtight one like this house, it is very important to manage indoor air quality (IAQ) during construction. That means three practices the builders must make habitual:
1) prohibit volatile chemicals inside
2) minimize dust generation
3) blow dust and chemicals out
Model Remodel has done a stellar job of managing IAQ. Every tube of caulk, can of sealer, or jug of adhesive has been policed by the superintendent to assure that only low or no VOC (Volatile Organic Compound) products are used inside (and outside for that matter). Fans are turned on whenever dusty or wet work is underway to blow contaminants outside.
Two operations in particular are notoriously dusty. Cutting and sanding gypsum board can leave a house covered in a fine layer of noxious white gypsum dust. Blowing cellulose insulation can make the interior feel like a Dust Bowl storm. On a visit to the job site after each of these tasks, I was amazed at the clarity of the air and absence of dust.
The benefit for the workers and the homeowners is clean air inside to protect their lungs. Once the house is occupied, all incoming air will be filtered to MERV 12. Only particles 1 micron or smaller can get in. That is almost as good as a hospital surgery room.