__________ are the windows which are fixed on the flat roofs to provide light in the inner portion of the building where light coming from the windows in the external wall is insufficient.

Doors, windows, and ventilators are essential building components that allow air and light to circulate.  Here are some types of doors, windows, and ventilators: Louver windows: Also called ventilation windows, these windows can be tilted to control the flow of air. They allow outside breezes to enter the home. uPVC awning windows: Also known as top-hung windows, these windows provide ventilation without letting in rain or leaves. They can be operated by clicking and are comfortable to use. Passive ventilation: Uses doors, windows, vents, louvers, and other openings to bring fresh air... Show more

Doors, windows, and ventilators are essential building components that allow air and light to circulate. 

Here are some types of doors, windows, and ventilators:
Louver windows: Also called ventilation windows, these windows can be tilted to control the flow of air. They allow outside breezes to enter the home.
uPVC awning windows: Also known as top-hung windows, these windows provide ventilation without letting in rain or leaves. They can be operated by clicking and are comfortable to use.
Passive ventilation: Uses doors, windows, vents, louvers, and other openings to bring fresh air into a home and let stale air out. 

Here are some things to consider when choosing doors and windows:
Location: The location of the door and window can depend on factors such as:
Dimensions
Use
Room location
Wind speed
Obstruction of light by trees or buildings
Relative humidity
Climatic conditions 

Ventilators in buildings can be used for a variety of purposes, including:

Mechanical ventilation
Systems that use fans and ducts to circulate fresh air.

Natural ventilation
A method of supplying fresh air through passive forces, such as wind speed or pressure differences. Natural ventilation can be achieved by using windows, doors, solar chimneys, wind towers, and trickle ventilators.

Exhaust ventilation
Systems that reduce the inside air pressure to below outdoor air pressure, then suck out stale air and replace it with fresh air.

Energy recovery ventilation
Systems that minimize energy loss while ventilating a home. These systems transfer heat from warm inside exhaust air to fresh outside supply air, which can reduce the cost of heating ventilated air in the winter. 

Other types of ventilation in buildings include balanced ventilation and smoke ventilation.

Doors, Windows and Ventilators opics include: Door components and types, window parts and types, doors and windows location and its technical terms, doors sizes and frames, doors fixtures and fastenings.

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