1. Selection of air volume

Air volume is the first factor.

in terms of design, the ventilation volume of the fresh air system in residential buildings is generally required to reach 1.45-1.7 times per hour, that is, air volume (m/h)= ventilation space (m)×(1.45-1.7) times per hour, or the air volume of the main engine is calculated according to the fresh air requirement of 31m/h per person per hour (generally, the larger of the two).

the indoor space can be roughly calculated according to the usable area, so as to determine how much air volume to choose for the new fan, and try to choose the big one rather than the small one.

Generally speaking, the greater the air volume, the faster the air exchange, and the fresher the indoor air will be. Therefore, it is suggested to choose a fresh air system with sufficient air volume to meet the indoor air quality standards according to the size of indoor space.

if the interior of the suite is 81 square meters (including bathroom and kitchen), the economical design can consider setting the sealing strip at the door crack in the bathroom and kitchen, and only select the air volume (65*2.8* ventilation times) according to the interior volume of the living room, dining room and bedroom suite, that is, (area * floor height * ventilation times).

2. filtration effect

filtration effect is the most important index, which is also the key to determine whether the fresh air system can really filter out PM2.5 and harmful substances. Kidman fresh air adopts 5-fold progressive filtration system to effectively filter outdoor dust, pollen smog and other pollutants.

3. Purification rate

Filtering effect is the most concerned by everyone. The filtering function of fresh air purification system depends on the filter screen inside the machine, and the air inhaled from the outside is filtered through the filter screen inside the machine to ensure that the air sent into the room is clean and fresh. Judging the filtering effect of a fresh air purification system is actually to look at the filter grade of the fresh air purification system.

The primary filter screen mainly filters large particles such as mosquitoes, flies and wool.

generally, the purification rate of PM11 with intermediate filter screen is 111%;

the high-efficiency filter is mainly responsible for filtering PM2.5-PM1.3 inhalable particles.

4. Replacement of filter screen

The filter screen is usually replaced once every 3-6 months, depending on the local air quality. Whether it is convenient to replace the filter screen is also an important factor. Generally, the ladder is needed to replace the filter screen in the ceiling crane, so it is very inconvenient to change the filter screen when climbing up. Kidman Fresh Air Cabinet Machine Cabinet Machine Installing and replacing the filter screen is as simple and convenient as opening the refrigerator.

5. Quantity and thickness

Under normal circumstances, the filtration system of fresh air system will be composed of primary filter, intermediate filter, high-efficiency filter and activated carbon filter, and the activated carbon filter usually appears in the system with internal circulation purification function. In addition, the higher the number of filter layers, the greater the resistance, which will affect the fresh air volume, so it is not recommended to choose.

6. heat exchange rate

heat exchange is the recovery of energy and the core of fresh air system. Usually in winter and summer, the heat recovery system is to recover the temperature of the air discharged from the outdoor to the indoor, so as to ensure that the indoor cold and hot energy will not be lost with the return air.

Simply put, the heat exchanger only exhausts dirty air, and the indoor cold and hot temperatures are recycled to the room by the exchanger. In this way, the cooling (or heating) load of the air conditioner can be reduced, thereby reducing the operating electricity bill of the air conditioner and ensuring that the indoor energy will not be lost. Therefore, even in countries with good air quality, it is necessary to install fresh air system for heat exchange, especially in places with hot and cold weather, the importance of heat exchange efficiency can be highlighted.

in addition to improving the comfort of our own houses, the heat exchange of new fans is also very significant for energy conservation and emission reduction from the perspective of the whole society because of its energy-saving effect. As the energy consumption is reduced, it will also briefly reduce the sources of smog and improve our homes.

7. noise index

noise is an important factor for everyone to consider.

the noise level of general residential buildings is allowed to be 45dB during the day and 37 dB at night, and fresh air system manufacturers will generally control the noise within 41dB. The purpose of installing a new fan is to get fresh air, and there is a good indoor environment. If the machine is installed and disturbed by noise all day, I believe everyone is not willing to install it.

therefore, it is very important to pay attention to the noise when the air volume of the fresh air system is minimum and when the air volume is maximum. The noise of fresh air purification system is proportional to the air volume, and the greater the air volume, the greater the noise, so we need to find a balance between air volume and noise when purchasing fresh air. Therefore, the general fresh air system will be installed in the kitchen or housekeeping room to stay away from the main functional rooms.

8. air supply mode

the general fresh air system adopts the mode of top delivery and top exhaust, which requires crossing beams and walls. There is also a special way, that is, underground air supply, which sends fresh air to the floor air supply outlet through a flat tube with a thickness of only 3 cm and relying on active pressurization technology. The supply air flow is fully replaced with the indoor dirty air and discharged from the top high position, forming the circulation of the whole indoor air flow. This air supply mode can save 5%-11% floor height compared with the traditional top air supply mode. Kidman Fresh Air has a variety of air supply methods, such as top delivery, top delivery and top delivery, and there is always one suitable for you.