The amount of space between the glazing is customizable, but typically ranges among 6mm to 20mm. The encouraged degree of space amongst the panes for double window glazing is 12mm, as this quantity delivers best thermal performance. Everything broader than 20mm will result in lowered insulation performance because of convection. https://griffiniarqt.oblogation.com/33787475/what-does-residential-secondary-glazing-mean