Another one provides a communications link and the third is to provide ventilation.

The visor provides better ventilation for hard work in hot weather.

This was installed to provide adequate ventilation in a mine.

They provide excellent ventilation especially during summer and aesthetically as well.

However, the frequent gaps between the tunnels provide good natural ventilation.

It features a central cupola to provide light and ventilation.

How can I provide ventilation for a gas fire in the lounge?

However, these should be designed especially for the purpose and provide both ventilation and security.

A window in C151 067/068 was smashed and doors were forced open to provide ventilation.

So, he said, the most important thing to remember is to provide proper and consistent ventilation.