Exposed ceilings can alternatively be referred to as "open ceilings" or "open plenums." All structural and MEP systems are visible in this sort of ceiling, either in their natural hues or painted. Interior design trends for today: With unique lighting and pipe fittings, an exposed ceiling offers for architectural freedom. The open concept allows for the free flow of air within the space while also allowing natural light to illuminate different areas at any given time. These ceilings are often found in commercial spaces such as offices, retail stores, and restaurants. They are also common in industrial buildings, such as factories or warehouses, that require a large amount of open space. Because there is no need for insulation under these ceilings, they are very easy to heat or cool. This type of ceiling is most commonly found in North America. They can be either concrete or steel. Concrete exposed ceilings are usually formed by pouring concrete over a metal grid system that has been placed on the floor before the concrete sets. These grids allow for adequate ventilation while still providing support for any additional load-bearing walls that may be needed. Steel exposed ceilings are built with horizontal beams that are attached to the building's structure with anchors. These beams then cross the room like rafters, supporting the roof above. An exposed ceiling provides many advantages for its owner. It gives the space a more open feel which many people find appealing.