That is interesting, also the Saturday the
AM dial talk shows, l go over the pros and cons of sealing off your crawl space or ventilating your crawl space with subject matter experts on both sides of the issue. It doesn’t repeat often but it comes around maybe once or twice during certain times of the year when it’s an issue.
Those issues are mostly regional. I spent over 30 years in the insulation and industry. Ventilation is vital in the Pacific Northwest. Not so much in the desert Southwest.