You must also take extraordinary precautions to enclose the area where you are working, to prevent dust from filtering into all other rooms.

Nintendo recommends users to leave a cartridge in the slot to prevent dust and dirt from entering the system.

The cover also prevents insects and dust from getting into the house/room.

But earwax seems to have the very humble role of being no more than biological flypaper, preventing dust and insects from entering the ear.

High-status examples could have plastered ceilings to prevent dust falling through into the horses' eyes.

Air filters are often used over intake fans, to prevent dust from entering the case.

A curio prevents dust and vermin from destroying the value of the collection.

It is sealed, to prevent dust causing a problem.

When closed, the cradles seal tight to prevent dust from floating in and building up.

Anti-static finish prevents dust from clinging to the fabric.