⑴The central air-conditioning system requires a good filter to protect it. If a low-efficiency filter is used, the central air-conditioning system will have the following problems

●Airway blockage, fan scaling, reduce the amount of air

●black stains generated near the air supply outlet

●Reduced efficiency of heat exchange components

●Failure of temperature and humidity measurement and control components

●Dynamic end air supply device malfunction

●Full heat exchanger failure

●The accumulated dust in the pipeline is an ideal place for microbial reproduction due to its moderate temperature and humidity

(2)The experience of developed countries shows that when the central air-conditioning system uses the F5 filter, it needs to be cleaned every 5-8 years, and when the F7 filter is used, it does not need to be cleaned for 30 years.

(3)For a good air conditioning system, the filter efficiency specifications should be F6-F7.

(4)In developed countries, the cost of cleaning air conditioning systems is 20 times the price difference between good and bad filters.

(5)Key points: The central air-conditioning system itself needs good filter protection, low-efficiency filters will cost users and contractors a lot.F7 efficiency filters protect the air-conditioning system for 30 years.