Generally, the term ‘secondary glazing’ refers to a further window set up on the inside of the current window. a, U and R values for only one-pane window retrofitted with SiCellA of various thickness over a 100 μm-thick supportive substrate connected into a glass pane (inset schematic); traces and symbols, https://deanowcgk.losblogos.com/26084908/how-bespoke-secondary-glazing-in-fulham-can-save-you-time-stress-and-money