English
Many people think of the scene of hazardous chemical leakage when they see the four words' gas mask '. In fact, there are two types of respiratory protection in daily life, with significant differences in applicable scenarios: one type is for preventing particulate matter (dust, smoke, fog); Another type of gas and vapor prevention relies on activated carbon filter cartridges for adsorption. The Fangdun 1105 series half face mask itself does not have filtering function and needs to be equipped with filters: KN100 filter cotton such as 2102N for dust environment, A1 type filter cartridge (5101) for organic vapor, E1 (5103) for acidic gas, and A1B1E1K1 (5107) for mixed pollutants.
The criterion for judgment is not "whether the taste is strong or not", but the type and concentration of pollutants. Painting, sewing, and using chlorine containing cleaning agents at home mainly produce organic vapors or irritating gases. In addition to opening windows for ventilation, a half face mask with a filter box can be considered; For dust generating activities such as cutting tiles, dismantling walls, and polishing, KN95 and above grade particle masks are usually sufficient. Industrial positions such as coal mines, stone materials, and sandblasting have high dust concentration and fine particles. It is more reliable to select according to the detection concentration of the position. KN100 filter cotton has a filtration efficiency of not less than 99.97% for 0.075 micron non oily particles.
So families don't have to stock up on equipment according to industrial standards. A more practical configuration is to keep a box of KN95 folding masks that comply with GB 2626-2019 for temporary dust operations; If the home is frequently decorated, frequently sprayed with paint, or exposed to solvents for a long time, consider a half face mask with replaceable filters.
The selection of a half face mask mainly depends on three factors: filter grade and LA certification mark, respiratory resistance, and fit. Fangdun 1105K and 1105C are both designed with dual filter boxes, featuring a food grade liquid silicone cover and ABS material components. The cover weighs approximately 125 grams and has a nominal inspiratory resistance of no more than 20 Pa and expiratory resistance of less than 50 Pa. Parallel connection of the dual filter boxes helps to disperse single-sided intake resistance. 1105K is an easy to fasten type, which does not need to be removed as a whole when drinking water or communicating halfway; When equipped with a 6102P dust filter box, the status of the filter cotton can be observed through a visual window. 1105C adopts a through type headband, suitable for occasions that require frequent wearing and taking off.
Two usage boundaries should be noted: the half mask is not suitable for oxygen deficient environments with oxygen content below 19.5%, nor is it suitable for high concentration environments that immediately threaten life and health. Such scenarios require gas supply equipment. Filters are consumables and should be replaced promptly when there is a significant increase in respiratory resistance, discoloration or damage to the filter cotton, or when an odor is detected; The silicone cover will age after long-term use, and it is recommended to regularly check its elasticity and sealing edges.
