I love the feeling of the fresh air on my face. A house built to modern standards of tight construction will allow only a very small amount of outside air to leak in. But fresh air is needed to dilute the products of human habitation (cooking, cleaning, breathing, combustion, etc.). After the cavity wall insulation and replacing the old garage door last year, I had to increase the amount of fresh air in Mr. Bowie’s suite. Fresh air is essential to prevent mold and mildew in homes. And we want to make sure that Mr. Bowie stays healthy.