Besides the air gap, the thickness of your glass also plays an important part. Thicker glass is simpler at absorbing seem than thinner glass, which permits larger seem energy absorption. Living beside a busy street, the double glazing had little if any impact on cancelling or lessening street noise (as https://immanuelf169flp9.laowaiblog.com/35711744/getting-my-london-secondary-glazing-to-work