1. Two windows, one outside the other, as a storm window, used to provide improved thermal and noise insulation.
2.A window which is double glazed, with an air space between.
3. Two windows, side by side, which form a single architectural unit.
1. Two windows, one outside the other, as a storm window, used to provide improved thermal and noise insulation.
2.A window which is double glazed, with an air space between.
3. Two windows, side by side, which form a single architectural unit.