The Basics of Gas Masks
best gas masks are a type of respiratory protection that covers the face and protects against inhaled poisonous gases. They are used in situations where air contamination by dangerous chemicals or biological particles is a threat to human health (see, for example, the SARS epidemic or the Middle East Respiratory Syndrome coronavirus outbreaks).
A gas mask has a box connected by a breathing tube to a mask that fits closely over the wearer’s face. The box contains granules that absorb the poisonous gases. The box’s lid is then closed and the respirator is activated. Air is inhaled through the mouthpiece and passes along the breathing tube through the granules. When the air no longer contains the harmful substances, it’s exhaled into the outside environment.
Filtration performance of a mask depends on the aerosol size and type, as well as the gas flow rate and pressure differential. The filtration efficiency decreases with an increase in the gas flow rate. The pore structure of the filter may also influence its performance.
The design of a mask should take into account the fact that there are many different face shapes in the world. This is especially important when designing a mask for children. Respirators designed for infants and small children must be tested on their ability to fit young faces properly. It is not recommended to use a mask on children who have lung diseases or who are infirm.
Activated carbon filters can be a useful addition to masks because they can be effective against odours. They are especially effective against organic compounds with a high molecular weight, such as tobacco smoke. However, it is important to remember that carbon filters do not offer particle filtration.