1, do not pay attention to the quality of the motor:
It is necessary to pay attention to the quality of the motor, the quality of the motor, the life may differ several times, good motor life can reach 15, 20 years or even longer; The service life of poor quality may only be broken in one to three years, and the longer the operation time, the noise will greatly increase. For the new machine, whether the motor quality is good or bad, the operation generally will not have a problem, so the initial is not obvious, the key lies in the long-term operation.
2, do not pay attention to the quality of the heat exchanger core:
The heat exchange efficiency is determined by the material and the heat exchange area. The price of good material and poor material will differ 20 times or even more. The core body is stacked by one piece, and the heat exchange area = the area of L pieces * the number of pieces. For example: two core bodies with exactly the same external size, the heat exchange area of 2mm piece spacing is 3 times that of 6mm piece spacing! Therefore, the larger the size, the smaller the sheet spacing, the larger the heat exchange area, the higher the heat recovery efficiency! Ignore the quality of the core (core) of the heat exchanger, so it is meaningless to buy the heat exchanger, just the business of the bothersome head, you will buy a comfort.
3. Over-believe that the full heat exchange core can be washed:
Regardless of merchants, total heat exchanger core ingredient is composite fiber, texture theoretically life is up to a decade or two years even more (premise is you must keep the core body completely clean, to ensure the efficiency and longevity), all single from material for hot core body can also be washed, but someone should tell you that the fiber once dirty, water wash is hard. Not to mention how is it possible to clean the inside piece by piece? Moreover, once the fiber water, the structure of the pores will change, seriously affect the heat exchange performance! So please clean it with an air gun/vacuum cleaner! All hot core unlike aluminum core, aluminum core itself metal surface is smooth, it is difficult to accumulate ash, in the normal use of dust-free aluminum core need not be replaced, and you can literally soak or rinse with water, will not change the performance and shape.
4, too much attention to the pm2.5 function of the controller:
What we need to breathe is clean and oxygen-rich air. The main source of PM2.5 is outdoor air rather than indoor. Only preventing outdoor dust from entering the room is the key! In the case of closed doors and Windows, after the new fan with purification is opened, pm2.5 can be reduced to a clean degree in a period of time. As long as the doors and Windows remain closed, the air can remain clean, and the pm2.5 value changes very little. If to pm2.5 index to automatically open or stop the new fan, when air to clean, new fan will stop working or running at low speed, the carbon dioxide CO2 concentration may start rising, less oxygen, indoor possible anoxic condition, so the control of indoor carbon dioxide is fundamental, can't put the cart before the horse, More attention should be paid to CO2 control.
5, can not distinguish "reducing machine" and "sufficient machine" :
"Cutting machine" is sometimes called "engineering machine" "real estate machine", with the lowest material cost of production of the machine, even in order to reduce the cost of their own copper wire to do the motor, with ordinary paper instead of heat exchange paper as the core, with recycled materials instead of new materials and so on. "Cutting machine" has two kinds, one is small size, all things are reduced version; One is normal size, appearance production packaging is beautiful, all the internal materials are the cheapest, especially pay attention to this kind of gold and jade its external defects which sell at a high price. In order not to be complained, "reducing machine" generally will basically ensure the air volume.