Everyone today wants energy efficient (replacement) windows. That means TIGHT..NO leaks. This is all in keeping with
Green.
We have another problem with people with allergy's and other respiratory problems. TIGHT windows are definitely tight. The people who are promoting these windows are not lying. They don't LEAK.
THAT'S the Problem. The house
Can't Breath..it becomes SICK.... because the air inside becomes stagnant...not enough air changeover. Think about it....Nah...... Don't. It's not politically correct.
You are not a scientist. BUT you don't have to be. It's just Common Sence.....DARE to try it...
NB