In modern buildings with tightly closed doors and windows, do you often feel that the indoor air is stuffy? In seasons with frequent haze, are you worried that outdoor pollutants are quietly sneaking into your home? The air filter fresh air system, this "invisible guardian" hidden between walls and pipes, is using technological power to build a defense line for our air quality.
1. What is an Air Filter Fresh Air System ?
Simply put, it is a set of active ventilation + deep purification intelligent systems. Different from the passive mode of traditional window opening for ventilation, it can continuously send outdoor air into the room after multi-layer filtration 24 hours a day, and at the same time force out indoor turbid air (including formaldehyde, carbon dioxide, lampblack smell, etc.), forming a "breathing cycle".
To make an analogy: if a house is compared to a sealed jar, ordinary ventilation is to lift the lid for "extensive ventilation", while the fresh air system is to install a "air inlet valve" and "exhaust valve" with filters on the jar, which can not only exchange fresh air, but also block "uninvited guests" such as dust and pollen.
2. Core Principles: Three - layer Purification + Two - way Flow
2.1 Air Inlet: From "Coarse Sieve" to "Fine Filtration"
Primary filter: Like an iron wire mesh, it first blocks hair, catkins and large particles of dust to protect the precision components at the back end.
Medium efficiency filter: Like fine gauze, it captures PM10 (particles with a diameter of more than 10 microns), such as coarse particles in haze.
High - efficiency filter (HEPA): This is the core defense line, which can filter 99.97% of PM2.5 (particles with a diameter of 0.3 microns), and can even effectively intercept cigarette smoke and dust. Some high - end models will also add activated carbon filters to absorb gaseous pollutants such as formaldehyde and TVOC.
2.2. Airflow Design: Scientific Cycle Rejecting "Short Circuit"
High - quality systems adopt two - way flow design: the air supply pipe sends the purified fresh air to the main activity areas such as bedrooms and living rooms, and the exhaust pipe draws air from areas with heavy peculiar smell such as kitchens and bathrooms, forming an orderly flow of "positive pressure in and negative pressure out", so as to avoid the "invalid cycle" where fresh air is directly discharged as soon as it comes in.
2.3. Energy - saving Key: Heat Exchange Technology
Will sending cold air in winter and hot air in summer increase the energy consumption of air conditioners? The total heat exchanger solves this problem. It is like an energy transfer station: the exhausted indoor air (such as heating in winter and air conditioning in summer) will transfer heat to the incoming outdoor air, making the temperature of the fresh air close to the indoor temperature, and the energy saving rate can reach more than 60%.
3. Three Mainstream Systems, How to Choose?
3.1. One - way Flow System: A Cost - effective Choice for Small Apartments
There is only a blower, which relies on indoor positive pressure to "squeeze" the dirty air out of the door and window seams. The installation is simple and the cost is low, but the purification efficiency and ventilation uniformity are weak, which is suitable for houses under 100㎡.
3.2. Two - way Flow System: Standard for Medium and Large Residential Buildings
The air supply and exhaust have their own fans and pipelines, which can accurately control the air volume. Equipped with a heat exchanger, it is suitable for families in the south or north who use air conditioners for a long time, especially families with the elderly and children.
3.3. Wall - mounted Fresh Air: A "Savior" for Decorated Houses
It does not need pre - buried pipelines, can be directly hung on the wall, and can be used by plugging in electricity. It is easy to install but has a small air volume, which is suitable for single rooms or local improvement, such as bedrooms and children's rooms.
3.4. Which Scenarios Must Be Installed?
Newly decorated houses: Continuously discharge formaldehyde, benzene and other decoration pollution, avoiding the embarrassment of "the house still exceeds the standard after being aired for half a year".
Haze - prone areas: Breathe clean air without opening windows, reducing respiratory discomfort.
Families with allergic constitution: Filter pollen and dust mites, so that patients with rhinitis can get rid of the pain of "sneezing non - stop".
Closed offices: Solve the problem of excessive carbon dioxide (easy to feel dizzy and sleepy) caused by dense personnel.
3.5. Guide to Avoiding Pitfalls in Purchase
Look at the CADR value: This is the core index to measure the purification efficiency. The higher the value, the faster the purification speed. For a 100㎡ house, it is recommended to choose a model with more than 400m³/h.
Check the filter grade: Recognize HEPA filters (H11 grade and above). Activated carbon filters should be "coconut shell activated carbon" with stronger adsorption capacity.
Listen to the noise decibel: The noise during night operation should be ≤35 decibels (equivalent to speaking softly) to avoid affecting sleep.
Choose intelligent models: Models with PM2.5 sensors can automatically adjust the air volume, and remote control via mobile APP is more convenient.
3.6. Daily Maintenance: The Filter Screen is a "Consumable", Don't Ignore It
Primary filter: Clean once every 1 - 2 months and replace once every 3 - 6 months.
Activated carbon filter: Replace it every 3 - 6 months. It will release peculiar smell after saturation.
HEPA filter: Replace it every 6 - 12 months. Overdue use will lead to reduced air volume and ineffective purification.
The air filter fresh air system is not a luxury, but a "basic health facility" in modern life. With silent operation, it hides fresh air in every breath. Choose a suitable system and maintain it regularly to keep this "invisible defense line" online and protect the breathing health of your family.