How long do I need to close doors and windows before removing formaldehyde?

Formaldehyde detection, generally two standards are often used, one is to close doors and windows for 1 hour, the other is to close doors and windows for 12 hours, of course, the formaldehyde limit is not the same, 1 hour, 12 hours.

This is the standard for GB 50325-2020. Close doors and windows for 1 hour inspection.

This is the standard for GB T 18883-2002. Doors and windows are required to be closed for 12 hours of inspection. Homes and offices generally refer to this standard for the sake of health. This one is a little stricter.

In addition to formaldehyde, close the window for a few days and then open the window.

In addition to formaldehyde, close the window for a week and then open the window, only fully let it play a role in removing formaldehyde, but this also depends on the specific situation, some time or even longer.

1. Depending on the actual situation, like winter, the indoor temperature is not high, and the volatilization rate of formaldehyde is slow, so the windows should be opened every day for ventilation. In summer, the indoor temperature is high and the formaldehyde release rate is fast, so you can close the window for about a week to let the indoor formaldehyde fully volatilize, and then open the window for ventilation.

2. As long as the temperature of the indoor space is not lower than minus 19 degrees, the general formaldehyde will slowly volatilize, and the higher the temperature, the faster its release rate, especially if the temperature exceeds 25 degrees Celsius.

However, it is also necessary to combine the indoor pollution situation, the more formaldehyde content, the more it will be released. If the indoor temperature is high, be sure to open the window for ventilation to let the formaldehyde in the air be discharged outside. Failure to ventilate in time may lead to more serious indoor pollution, which is more difficult to control.

3. In the cold winter, we tend to close the windows, so that the indoor air will not be able to circulate. If there is formaldehyde in the space, it is easy to volatilize, and it will also produce other harmful gases, which will cause a lot of damage to the human body if you live for a long time.

4. And when the window is closed, there is not much difference between the space and the secret room, and the release time of formaldehyde will be very long. And man-made panels.

In the process of use, formaldehyde is often volatilized continuously, and the maximum release time is 15 years. It can be seen that the work of removing formaldehyde is a difficult task, and we will inevitably cause many impacts if we live in it rashly.

5. When we remove formaldehyde, although the indoor temperature rises, the formaldehyde can be released, and then the window can be opened to discharge. However, this practice can only release most of the formaldehyde, and formaldehyde is continuously released, so it needs to be treated with the help of other methods. For example, a few pots of green plants can beautify the space, and play a role in controlling the air and converting harmful substances into inorganic substances.

Although the effect is not great.

Doors and windows are usually closed for at least 24 hours. Some will close doors and windows for 2 to 3 days, in order to release formaldehyde into the air in indoor furniture items containing formaldehyde for easy detection. After removing formaldehyde, the doors and windows should also be closed for a certain period of time, and then the indoor air should be tested to see if the indoor air is normal and up to standard.

Doors and windows need to be closed for 12 hours before measuring indoor formaldehyde. According to the "Indoor Air Quality Standard" GB T18883-2002 issued by the General Administration of Quality Supervision, Inspection and Quarantine, the Ministry of Health and the State Environmental Protection Administration, the room is closed for 12 hours for testing, and the formaldehyde does not exceed milligrams of square meters.

Precautions for measuring formaldehyde:

1. Close the doors and windows for 12 hours before testing.

2. Close doors and windows during sampling.

3. The sampling time is more than 45 minutes.

4. The sampling point should avoid the vent.

5. In principle, the height of the sampler is consistent with the height of the human breathing zone. The relative height is between.

Before removing formaldehyde, it is generally necessary to close the doors and windows for more than 24 hours at this time, and it is necessary to ventilate after removal.

Before removing formaldehyde, close the doors and windows overnight. In this way, the amount of formaldehyde volatilized in indoor warmth is relatively sufficient. Then open the window for ventilation to remove formaldehyde. Close the doors and windows again at night. Open it again during the day, so that the speed of formaldehyde removal will be much faster.

12 hours (i.e., so the results of the air test with the doors and windows closed for 12 to 20 hours will be closer to the truth.)

It should be how long the test needs to be turned off, 1

Close doors and windows for 12 hours before testing.

Close doors and windows while sampling.

The sampling time is more than 45 minutes.

Sampling points should be avoided from vents.

In principle, the height of the sampler corresponds to the height of the human breathing zone. The relative height is between.

Since people spend about 90% of their time indoors, especially in winter and summer. With the doors and windows closed and the air conditioning on, the time spent indoors is much more than 12 hours a day, if followed"1 hour"Standards to detect indoor air, not only does not conform to the state of daily life, but also difficult to detect pollutants in such a short period of time, it is very likely to mislead occupants, so that they think that indoor air is qualified (in fact, it may not be qualified), and in the future, they are not aware of the harm of harmful substances such as formaldehyde, benzene series, and TVOC in the air.

Formaldehyde can not close the doors and windows, you must open the doors and windows to ventilate, and it takes more than three months to open the doors and windows.

There is no need to close the doors and windows when removing formaldehyde, it should be ventilated, and the methanol should be put in good for him. Then turn it off and use a normal formaldehyde removal instrument.

How long do I need to close the doors and windows before paying? It depends on the situation in his own home, and I think what he said was what he said for a period of time, that is, if he went to that place to find money, so that the effect would be better.

Do I need to keep the window open all the time to remove formaldehyde? Yes, especially in the summer. In summer, the light hours are long and the temperature is high, which makes it easier to release formaldehyde.

Close the window for a period of time to increase the indoor temperature, which is more conducive to the release of pollutants, and then open the window, which can emit more harmful gases. Therefore, windows should be closed during the day to increase room temperature, and windows should be opened for ventilation at night to reduce indoor formaldehyde content to achieve better formaldehyde removal. A newly renovated new house needs to open a ventilated window, but don't always open a ventilated window, because this method is more suitable for indoor formaldehyde has been completely released, some boards or furniture, wardrobe in the formaldehyde is not released all at once, it will be released slowly, in this case, you can choose a boring few days to open for a few days.

<> because the door is closed, the stuffy way can raise the temperature of the room, and when the temperature rises, the formaldehyde will be released faster. Then open the window for ventilation, and the effect of removing formaldehyde will be better. Otherwise, the window has been opened for ventilation, but the formaldehyde has not been released, only a lonely window has been opened, which has no effect of removing formaldehyde.

So the right thing to do should be to be stuffy for a few days, and then open the window for a few days, and in the process of stuffing for a few days, you can increase the temperature of the room, such as turning on the heating or turning on the air conditioner, and raising the indoor temperature is fine. Window ventilation can promote indoor and outdoor air circulation, removing formaldehyde through natural dilution, which is currently the most commonly used method.

However, it should be noted that the release of formaldehyde is slow, as long as 3-15 years, it does not take a few months of ventilation to solve the problem, when the indoor temperature rises slightly after the humidity moves, the formaldehyde will exceed the standard, so window ventilation can only be used as an auxiliary method other than formaldehyde. Activated carbon can rely on its developed pore structure and specific surface area, and can be in contact with the surrounding air to a large extent, passively adsorbing some pollutants into its pores, so it is widely used for indoor formaldehyde removal. Activated carbon of coconut shell material has the best adsorption performance.

However, the adsorption capacity of activated carbon for formaldehyde is weak, and the adsorption will reach saturation. After saturation, it is susceptible to external factors, desorption, resulting in secondary pollution.

Many new homeowners know that after the house is renovated, indoor ventilation must be carried out for a long time, in order to discharge formaldehyde in furniture or other decoration materials. But is it okay to ventilate and remove aldehydes just by leaving the windows open all the time? In fact, there are many details that need to be paid attention to, otherwise it is ineffective aldehyde removal.

Note 1: Do not open the window immediately after the decorationThe newly renovated house, many decoration materials and furniture are not completely dry, and the windows are directly opened for ventilation after installation, which is easy to accelerate air drying, which will have a great impact on gypsum, walls, furniture, etc., and will seriously lead to wall cracking and furniture deformation.

Note 2: Stagger ventilation in the morning and eveningIn the season of large temperature difference, the temperature at night is too low is not conducive to the release and emission of formaldehyde in the new house, and at the same time, the temperature difference is too large and it is easy to destroy the decoration, so it is best to choose the way of closed daytime ventilation at night to avoid the indoor temperature is too low, which affects the formaldehyde emission and ventilation effect.

Since formaldehyde in decoration is inevitable, and it cannot be completely relied on ventilation alone, how to solve formaldehyde in decoration?

1. Reduce formaldehyde release from the sourceIf it's a new house that hasn't started to be renovated yet, we canChoose eco-friendly furniture, eco-friendly materials, so as to reduce the release of formaldehyde。Because the formaldehyde content inside the furniture is very high, if you choose inferior materials, the formaldehyde release cycle is as long as more than ten years, which is undoubtedly coexisting with chronic poisons.

2. The fan cooperates with the ventilation of the whole houseWeather conditions permitting, we can place each room on a ventilated basisA fan to help increase ventilation is also a good way to speed up the release and circulation of formaldehyde。Ventilation can be used as one of the methods of adjunct.

3. Purification and decompositionBaizao Na has added a two-group decomposition ingredient and canEffectively decompose formaldehyde, three years of sun-freeActivated carbon can only be adsorbed but not decomposed, and needs to be replaced regularly.

Fourth, furniture spraying decomposition mediumThe algae spray adds a double group of decomposition components, after uniform spraying, it will form a transparent decomposition layer on the surface of the furniture after it is dried, because its decomposition components reach nano-level particles, which can easily penetrate into the interior of the furniture board for induced decomposition, and have a good decomposition effect on accelerating the purification of formaldehyde, benzene and TVOC released from decoration pollution. And its pH value is neutral, and the safety and effectiveness of mother and baby can be assured.

It is definitely necessary to keep the windows open to get a good ventilation, and you can also get a good ventilation, which can make the formaldehyde in the home become very small, and you can put some pothos.

If you need it, in addition to keeping the window open, you can also put some activated carbon at home, put some light coal, or turn on the air purifier to remove formaldehyde.

Need. Ventilation to remove formaldehyde is the best way to remove formaldehyde, and formaldehyde can only be dispersed by opening windows.

The most common way to remove formaldehyde indoors is to open windows for ventilation, which is the simplest and most convenient, and it is also a zero-cost method, but it is also related to the location of the house, the house type, and the weather, so if you want to only use the ventilation method to remove formaldehyde, it is not very stable, and it will be subject to many restrictions.

1. Wise Stone

It can actively adsorb indoor free formaldehyde, the process will not be affected by any external factors such as temperature, humidity, light, etc., the adsorption rate of formaldehyde is also dozens of times that of ordinary adsorption materials, in addition to the unique decomposition function, the adsorbed formaldehyde can be decomposed into harmless carbon dioxide and water, and then discharged, so that its internal pores have been in an unsaturated state, and the aldehyde removal rate can reach more than 90%. When choosing, it is important to note that it is a gray ore with an irregular shape and is not a round particle

2. Open windows for ventilation

The most common way to remove formaldehyde indoors is to open windows for ventilation, and this method has almost no cost. But the ventilation method also has disadvantages, first of all, the location of the house should be good to achieve the effect of ventilation, and secondly, the formaldehyde in the decoration materials is in a state of continuous release, and it is impossible to completely remove formaldehyde through window ventilation, it can only play an auxiliary role in removing formaldehyde.

3. Activated charcoal

Activated carbon to remove formaldehyde is the most commonly used way to remove formaldehyde in life, and the cost is low, but activated carbon is prone to adsorption saturation in a short period of time, and it needs to be replaced or dried after saturation. Another point to note is that if the amount of activated carbon is not enough, it will not play much role in removing formaldehyde indoors.

Fourth, photocatalysts

Photocatalyst, as the name suggests, is a catalyst mentioned in our junior high school chemistry, which decomposes formaldehyde into carbon dioxide and water through light, reduces the formaldehyde content in the room, and achieves the purpose of removing formaldehyde.

Fifth, the fresh air system

The fresh air system can ensure that the home is in a ventilated state 24 hours a day, which can greatly increase the exchange of indoor air and the outside world, although the effect is very good, but the first time of this fresh air system is more expensive, and it is a better choice to install it before decoration.

Indoor removal of formaldehyde should be done by closing the window for a few days, depending on the actual situation

If it is in winter, the indoor temperature is not high, and the volatilization rate of formaldehyde is slow, so the windows should be opened every day for ventilation.

If it is in summer, because the formaldehyde release rate will be faster when the temperature is high, so before opening the window, you should close the window for about a week to let the temperature in the house rise, so that the formaldehyde left in the furniture will volatilize into the room, and then open the window for ventilation, the effect will be better.