“A curtain wall” might be a non-bearing wall. One that just creates a barrier between two spaces. But there is no difficulty differentiating between a wall and a window.

Unlike other building materials, a curtain wall system is thin and lightweight, usually aluminum and glass. These walls are not structural, and by design, they are only able to carry their own weight, while transferring the load of wind and gravity to the structure of the building. The design makes it air and water resistant, to ensure that the interior of the building remains airtight.

Here we also have a reference from wiki, A curtain wall system is an outer covering of a building in which the outer walls are non-structural, utilized only to keep the weather out and the occupants in. Since the curtain wall is non-structural, it can be made of lightweight materials, thereby reducing construction costs.

Topbright's curtain wall products are those that integrate smoothly with building surfaces, properly installed, simply look better to most spectators, a major concern for buildings and systems that will be present for several decades.

We take our integrity very seriously and are committed to completing your project using quality products, on time and on budget.