Is there any visible change to the window viewing area from installing the vent and hole drilling?
The small access holes and vents used in our window restoration process are practically invisible. They are discreetly positioned in the corners of insulated glass units, outside of the main window viewing area. Most upper vent holes are usually covered by blinds or drapes. The lower vent hole can only be seen from an oblique angle and is not very obvious. Most clients are very happy with the dramatic increase in the main viewing area of their old foggy window, after the condensation has been removed.
