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List - I have lost more than 200,000 painful experiences, telling you how to buy a fresh air system. The author said that installing a central fresh air system (full heat exchanger with filter) may face The problem is that the room size is reasonably allocated to the air supply volume, so that some rooms form a negative pressure, which causes the di*ty air to be poured into. 2. After the installation, if the maintenance is neglected, the pipeline will be contaminated, and once opened, the home will be polluted twice. The installation has a great impact on the effect. The design and installation team is very important. The author thinks that it is suitable to install the pipeline type fresh air (the whole heat exchanger with the filter). 1. Take the fresh air to other rooms and keep the positive pressure in the room. 1. The proximal end of the inlet air is not sealed, and the fresh air may not flow to the remote room. 2. No heat exchange affects the room temperature. Decreased energy consumption effect is obvious, short-circuit the air flow is not a problem. However, the formaldehyde and TVOC measured by the author's environment, however, the author did not mention the outdoor, indoor and air inlet temperature performance, and did not have any photos or information to support the effect. Looking at the conversation should be to buy Dephina's pipeless wall mount. Pacific Internet - talk about the mixed negative ion air purifier to allow the particles to settle but not disappear, may be attached to the table, the floor, etc., personnel activities may cause it to rise again in the air 2. After the particles and pollutants are combined, easy Attached to the wall, ceiling, and make it di*ty 3. It will produce ozone, generally not exceeding the standard, but it is still the risk of Sohu digital tail - by experience the Dyson HP04 machine, talk about air purification fan LINE TODAY - Destroy All sources of pollution in the air! Atmosphere Sky An Liyi's new air purifier has a superior filtration effect and the highest standard in the industry! Intelligent technology and star-to-house service, so that you don't have to pay much attention, you can also breathe in and find the fan used in the old version. AmoB Forum - Amway Yixin also uses PAPST motor (Figure) R3G225-AE17-11, It is an EC fan. However, this is the 230V version. Taiwan should use 115V. The particle sensor is Hanwang's TVOC sensor. Sensirion SGP30. The main problem seems to be 1. Vertical use will affect the airflow particle detection value of 0 and touch. Screen heating affects the detection of temperature and humidity. However, Qingping said that the compensation operation has been done and should be quite accurate. 3. TVOC