Two other types of respirator systems solve the leak problem.

For the full-face mask, a rubber hood goes over the head and creates a tight connection with the face.

It is basically a rubber mask which covers the face and has transparent plastic areas covering the eyes so you can see out of it.

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Gas masks -- more generically known as respirators-- are also an important part of industrial safety on a daily basis. They filter the air so that it can be safely transferred into the lungs of the user, without the polluted air particles from fumes or gases.

Any time there is a threat of biological or che­mical attack, the first thing you hear about is gas masks. They protect workers against everything from flour dust in a grain elevator to the damaging organic chemicals in paint spray. In order to have a better understanding regarding how gas masks work, you need to think of them as inhalers because their job is very similar.

How do gas masks work. How does a gas mask work?

In the mouth area, there is a canister with a filter inside of it. The problem with air-purifying respirators is that any leak in the mask makes them ineffective.

A gas mask may not be practical for most people, even in the event of a chemical or bioterrorism attack.

The leak could come from a poor fit between the mask and the user's face, or from a crack or hole somewhere on the mask. The exhale valve has a rubber that stops air from coming in, only allowing air out, whereas the filter port works the other way around.

Have you ever wondered how a gas mask works? How effective is a gas mask in a situation of chemical warfare?