Argon gasoline is a popular choice for improving performance in double- and triple-pane windows. Argon, an inert fuel, is denser than air, which really helps to reduce the transfer of heat involving the inside and exterior of a developing. Take note: These values are for the middle of glass only. https://landenghale.izrablog.com/35232647/the-definitive-guide-to-secondary-glazing-london