How many kinds of household air filter are there?
Ideal ventilation and air conditioning systems are equipped with air filters. The air filter is divided into three kinds: primary effect, medium effect and high efficiency. Available according to different requirements. Use the appropriate grade of filter. General household is mainly divided into haze, hair, dust, particulate matter and formaldehyde and other harmful gases. The air conditioning system of sterile operating room should be equipped with at least primary or medium effect filter. The number of ventilation and air change in the operating room should be more. When the filter efficiency at the end of the two-stage filtration system is above, the number of air change should be once per hour. If a HEPA filter is installed, the number of air changes per hour is one, so that the number of bacteria in the air during the operation can be kept within a safe range. Then, Dyson Air purifier can meet all the functions at home and hospital level.