English
The core working principle of a self-priming filter gas mask is to rely on the wearer's own negative breathing pressure to drive the air. The external air is purified by the filter box and enters the mask for inhalation, while the exhaled gas is discharged through the exhalation valve. Due to not relying on external gas supply, this type of product has specific usage boundaries. Before operation, it is a scientific selection sequence to clarify "what to prevent" before deciding "how to wear".
Fangdun1680, as a full face cover, emphasizes the fit and comfort of wearing in terms of structure and material. The cover is made of food grade liquid silicone, with a soft interface that can fit well with facial contours; The screen is made of polycarbonate material, which combines transparency, anti fog function, and scratch resistance. In terms of fixing method, the product adopts a five point fixing design, combined with high elasticity rubber bands and high elasticity soft silicone, which helps to disperse head pressure. The air valve system adopts a combination design of face screen inhalation valve, nasal mask inhalation valve, and cold flow exhalation valve. The aerospace grade material valve plate is tested one valve at a time, aiming to reduce respiratory resistance, quickly discharge moisture, and maintain clear vision.
The face mask adopts a three-point buckle interface, which can flexibly connect to various filtering elements. The supporting 5000 series filter boxes are subdivided according to the protected objects: 5101 type corresponds to A1 level organic gases or vapors; 5103 type corresponds to E1 grade acidic gas; The 5107 type is multifunctional, covering organic vapors, inorganic gases, acidic gases, as well as ammonia and its organic derivatives. Protection has specificity, and it is recommended to select according to the actual pollutant category on site to avoid cross range use. In addition, this interface can also be equipped with filter cotton through the FJ-35 socket to achieve dust and toxin combination protection.
Safe use requires strict adherence to boundary conditions. In scenarios where the environmental oxygen content is below 19.5%, the type or concentration of pollutants is unknown, the concentration exceeds the protective capacity of the filter, IDLH environment, enclosed space, underwater, and fire hot zone, the use of filter masks should be stopped and positive pressure air respirators or long tube gas supply systems should be used instead.
In daily maintenance, it is necessary to perform positive and negative pressure air tightness self inspection before wearing. The replacement of the filter box should not be judged solely based on odor, as some organic solvents can cause olfactory fatigue. It is recommended to record the opening time and cumulative usage time. When there is an odor or significant increase in respiratory resistance, it should be promptly evacuated and replaced; At the same time, it should be noted that the period of time that has been opened but not used should also be included in the service life.
