Dust-free

Everything in the mosque was dust-free.

Keep your computer and its peripherals clean and dust-free.

You should always keep your laptop clean and dust-free.

Keep the computer in a clean and dust-free environment.

Clean the stereo regularly to keep it dust-free.

Injector testing under pressure has never presented any difficulty. It is carried out in a small, dust-free cubicle fitted with an extractor fan and the meter calibration is checked annually.