Among them, the filter gas mask consists of a mask and a poison filter tank (or filter element). The canister is used to purify polluted air, and contains a smoke filter and an adsorbent. These two materials can also be mixed to make filter plates and assembled into filter elements. A lighter canister or filter element (about 200g) can be directly connected to the mask, while a heavier canister communicates with the mask through an air duct.
Isolated gas masks are provided with oxygen by the mask itself, which can be divided into three types: gas storage type, oxygen storage type and biochemical oxygen type. It is mainly used in high-concentration polluted air (when the volume concentration is greater than 1%), or in special occasions such as high altitude, underwater and oxygen-deficient closed cabin.
When choosing a gas mask, you need to consider the protective effect, comfort and the weight of the mask. At the same time, in order to ensure the protection effect, it is necessary to choose filter tanks or filter elements that meet international standards, such as P-A- 1 series filter tanks, which can effectively protect against the harm of asphalt smoke. In addition, we should pay attention to the way of wearing the gas mask, ensure the tightness of the mask and prevent harmful gases from entering.
Please note that the above information is for reference only, and the specific choice should be decided according to personal circumstances and needs. If in doubt, please consult a professional.