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The classroom is the main place for students to study every day. The air quality in the classroom is directly related to the students’ physical and mental health and learning efficiency. Their bodies are in the growth and development stage, and their immunity to pollutants is much weaker than that of adults. Their learning environment is even better. It deserves special attention. At the beginning of primary and secondary schools, the “Haze Prevention Strategy” summarized classroom air problems and provided some cases of German schools for the reference of education departments and parents.

1. Four Harmful Classroom Air

• The infiltration of outdoor PM2.5 is harmful☆☆☆☆
• High CO2 concentration is harmful☆☆
• The spread of infectious bacteria is harmful☆☆☆
• Formaldehyde pollution hazards☆☆☆☆

Outdoor PM2.5 infiltration hazards Star rating: ☆☆☆☆

In a haze day, even if the doors and windows are closed tightly, small PM2.5 dust particles can still infiltrate the classrooms through the doors and windows and the gaps in the building. Incomplete tests have shown that the PM2.5 concentration in the classroom is slightly lower than that of the outdoor by about 10% to 20%. This is because all the students act as “human flesh purifiers.” The preventive measures of students against PM2.5 are almost equal to zero. Because PM2.5 particles are extremely small, the human body has no ability to filter and block them. The particles are easily swallowed by alveolar phagocytic cells and enter the bronchus. Therefore, PM2.5 can cause great damage to the human respiratory system and easily cause asthma, bronchitis, etc. disease.

High CO2 concentration harms star rating: ☆☆

Popular science tips: The outdoor CO2 concentration is about 400ppm, and a person exhales about 15 liters of CO2 per hour when sitting still. In haze days, winter and summer, classroom doors and windows are usually closed, and the indoor CO2 concentration increases. The CO2 concentration in the classrooms of 35 students reaches 2000~3000ppm. Higher CO2 concentration causes students to produce symptoms such as chest tightness, dizziness, distraction, drowsiness, and memory loss. Therefore, when the teacher reports that your children are always going to go in school, it is likely to be affected by bad CO2.

According to the results of a student attention test in Austria, when the CO2 concentration increases from 600-800ppm to 3000ppm, the student’s learning efficiency plummets from 100% to 90%. The German Environmental Protection Agency recommends that when the concentration is less than 1000ppm, the hygienic condition is reasonable, when the concentration is 1000-2000ppm, attention should be paid to and ventilation measures should be taken. When the CO2 is greater than 2000ppm, the air hygiene condition is unacceptable.

Infectious germs spread hazard Star rating: ☆☆☆

The classrooms are densely crowded and the humidity is high, and bacteria can easily breed and spread, such as mumps, chickenpox, influenza, bacillary dysentery, etc.; campuses are prone to outbreaks of communicable diseases from March to April and October to December every year . In 2007, Shanghai carried out air monitoring in 8 elementary and middle schools in Fengxian District, and found that the total number of air bacteria in the classroom was 0.2/cm2 before class, but rose to 1.8/cm2 after the 4th class. If the classroom is poorly ventilated, and a large number of germs produced by students coughing and sneezing will accumulate and spread, one person will get sick and many people will be infected.

Formaldehyde pollution hazard star rating: ☆☆☆☆

If it is a newly built or remodeled classroom, the building decoration materials and new desks and chairs will volatilize harmful gases, including formaldehyde and benzene. Decoration pollution is very harmful to the health of students, and it is easy to induce blood diseases in children, such as leukemia; at the same time, it increases the incidence of asthma; and affects the intellectual development of students. In September 2013, the Wenzhou Environmental Supervision Detachment randomly inspected 88 classrooms in 17 early childhood education institutions in Wenzhou, 43 of which exceeded the standards for formaldehyde and total organic volatiles, that is, 51% of the classrooms had unqualified air quality.

2. German experience in classroom air hygiene

Some time ago, there were often news that parents sent air purifiers to school classrooms. Such a move can slightly reduce the damage of some dirty air to students; however, to solve the four major hazards mentioned above, this is just a drop in the bucket, and it is far from enough. . To solve the four hazards of classroom air, for PM2.5, it seems that doors and windows should be closed tightly, and for the other three hazards, doors and windows should be opened to increase ventilation. How to solve this contradiction? The experience of German schools is that the effect of window ventilation is affected by the wind direction and speed, and the effect cannot be guaranteed, and window ventilation in winter and summer is also restricted; therefore, to improve classroom air quality, it is necessary to actively and reasonably control the supply and exhaust air, so as to supply sufficient air. Amount of fresh air, exhaust the turbid indoor air. There are mainly two types of mechanical ventilation devices installed in the classroom:

Centralized ventilation equipment.

It is suitable for newly-built schools, and the ventilation volume can meet the fresh air of 17~20 m 3;/h for each student. The big guy on the roof of the cover picture is the centralized ventilation equipment. The white round pipes at the top of the photo below are the fresh air supply ducts and long air supply openings in the classroom corridors.

Decentralized ventilation equipment

The use of decentralized ventilation equipment is suitable for renovating schools, and each classroom is independently ventilated. The light-colored squares on the outer wall in the picture below are decentralized ventilation equipment.

Some schools in Germany also have air quality detection and alarm devices, and the air volume can also be adjusted according to the CO2 concentration. In addition, most of the ventilation installations in Germany also have heat recovery devices, with a heat recovery efficiency of more than 70%, and great emphasis on energy saving and emission reduction.

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Today’s houses are built on the basis of energy efficiency, resulting in trapped indoor air.

The trapped air may be full of pollutants in the air, such as toxic chemicals in the exhaust gas, cleaning supplies, or radon.

Other pollutants in the air, such as odors, indoor allergens, and viruses, can also be trapped in your home. Trapped air can negatively affect your comfort and health.

Common household pollutants:

• Mold, mold, and biological contaminants
• Household Chemicals
• Formaldehyde
• Cigarette

The ventilation system of KCVENTS helps to create healthy air in the Home. By intake fresh air from the outside, we can dilute the pollutants in the air, such as allergens, chemicals, viruses and bacteria, and radon. Pollutants can make you and your family sick. The ventilation system also helps to exhaust the moist air trapped outside to improve indoor comfort and health.

In addition to comfort and health, our ventilation system is also energy-efficient. Each ventilation system has temperature and humidity sensors to determine the best time to introduce fresh air from the outside to reduce energy usage.

Control health

The fresh air blower from KCVENTS can suck in fresh and clean air from outside. One of the main benefits of fresh air machines is to improve health. Dilution of pollutants in the air can help improve your overall health by reducing disease, increasing productivity, or reducing allergy symptoms.

Control comfort
Use fresh air fans to reduce odor and humidity problems and improve the comfort of your home.
 
Protect your home
Excessive humidity is a breeding ground for mold and mildew. It can cause condensation on the windows, destroying their finishes and structural integrity. The ventilation system throughout the home works with other indoor air quality solutions to minimize damage caused by moisture. Home works with other indoor air quality solutions to minimize damage caused by moisture.
 
Energy saving
A new fan from KCVENTS is designed with energy efficiency in mind. It only runs at the best time to help reduce your home’s energy costs. Use the KCVENTS WiFi thermostat app to increase control. This smart phone app lets you choose when to run, so you have more exposure to your new fan.

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Now the winter is coming. Everyone knows what it’s like in a cold winter – sitting in a stuffy house because we’re obsessed with ‘keeping heat in’. Single room heat recovery units look to be a solution, pumping room-temperature fresh air into our homes to improve the indoor air quantity(bring Continuous oxygen)

Single room heat recovery works in the same way that a whole house heat recovery system would by extracting damp and stale air to prevent condensation and mould. It also supplies fresh, filtered air, and can recover normally lost heat.

KCVENTS VT501 is wall mounted HRV which is designed to improve indoor air quality and lower the risk of condensation. Single room heat recovery units tend to be more efficient than traditional extract ventilation systems, but are not as complex to install as the centralised packaged units that you tend to have for the whole building.

KCVENTS VT501(wall-mounted heat receivery ventilator) has 3 working modes.it continuously extract moist air from rooms in the home, which is especially important in bathrooms, utility rooms and kitchens. when fresh air is sucked in from outside, it collects heat from the extracted air (via a ceramic heat exchanger) before entering the room. This heat energy transfer can help save money on energy costs, because it keeps temperatures more constant than when opening windows for ventilation. Latent air is recycled and transferred back into the room to keep a consistent temperature environment.

Where to get a great single room heat recovery unit? Check it here

Where to get a great single room heat recovery unit? Check it here Alibaba

This winter, there was widespread rain and snow across the country, and the temperature gradually dropped after the beginning of winter. Both the southern and northern parts of my country have entered the season of high incidence of respiratory infectious diseases such as seasonal influenza. Mostly children. This kind of weather has made kindergartens and schools lively with epidemic viruses. Recently, there are not a few children who have been infected by epidemic diseases. This has caused many parents and teachers to feel headaches. If the children are sick and cannot go to school, who will bring them, and their homework will be delayed. Who will make up? The high absenteeism rate in schools and kindergartens has caused controversy in schools. These are all difficult problems. In winter, the weather is cold and the doors and windows are tightly closed. The air is not in a confined space. Circulation is prone to the problem of one infection and multiple infections.

Studies have shown that the higher the concentration of PM2.5 particles, the higher the probability of inducing diseases such as asthma, bronchitis and cardiovascular disease. Especially on the basis of influenza, PM2.5 particles are inhaled by the human body into the bronchus, which interferes with the gas exchange in the lungs, and the chances of inducing asthma and coughing will be greater. The school is crowded with people, the space is small and confined, and the PM2.5 in the air instantly explodes. If you encounter smog or extreme cold weather, the probability of infection will greatly increase. This is also the focus of society.

At this time, the fresh air system can come in handy. Now many schools and kindergartens adopt the method of installing fresh air systems to prevent these problems, not only to prevent infectious diseases, but also to fight haze and ensure the oxygen that children need to grow up. The diameter of the virus is generally less than 1 micron, that is to say, the diameter of the virus is much smaller than PM2.5. Many people believe that the filter of the fresh air system cannot filter out the virus because the diameter of the virus is so small. But the fact is far from the case. Because the diameter of the virus is small, it is easy to be adsorbed by PM2.5 particles. When the fresh air system filters PM2.5, it will also filter out most of the virus. The fresh air system creates an effect that the indoor air is discharged layer by layer from top to bottom, and also creates an effect that the indoor air is getting cleaner from top to bottom. Even if there are people who are suffering from flu indoors, the virus will be filtered from the upper part of the room along with the airflow and sent out outdoors.

The KCVENTS VT501 school fresh air system is specially built for schools. With “black technology” and humanized design, it has become the school’s “exclusive purification guard”! In terms of purification power, KCVENTS VT501 uses a large area and high-density filter. The primary, medium and high-efficiency three-stage filtration can effectively filter PM0.1 particles in the air, and the purification rate of PM2.5 is as high as 99%! Secondly, in terms of air circulation performance, the KCVENTS VT501 fresh air system can continuously deliver fresh outdoor air to the room. After the air is exchanged and purified, the dirty air in the room is exhausted to the outside, fully ensuring that the teachers and students in the classroom are always there. Enjoy the “natural wind”!

The wall-mounted HRV VT501 fresh air blower is unique to fresh air. Its installation method is to drill holes on the wall, and then install the fresh air blower on the hole. Through this hole, the indoor and outdoor air can be replaced, so as to achieve the purpose of purifying the air.

Advantages:

Modular installation

The fresh air wall-type fresh air fan generally has a relatively small air volume. Each bedroom or living room will configure the location and number of fresh air fans according to the area, and finally achieve the purpose of independent “breathing” in each room.

Easy to install
The installation of wall-mounted fresh air fan only needs to punch a hole in the wall, and professional punching tools will not affect the decoration style of the family.

Low noise

The ventilation concept of the fresh air wall type machine is to ventilate continuously for 24 hours. The air volume of the fresh air blower is generally relatively small, the noise is also very small, and it has no impact on daily life.

Simple maintenance

The wall-type fresh air blower has a simple way to replace the filter element, and it can be learned once in operation, so there is no difficulty in maintenance.

Low cost

The power of the wall-mounted machine is relatively small, and if it is ventilated for 24 hours, the monthly electricity bill is only 2-6RMB; the filter element only needs to be replaced once in 3-6 months, and the price of the filter element is not high. Therefore, if a wall-mounted machine with fresh air is installed, the maintenance cost is low and the daily power consumption is low. It is the first choice for your home.

Notice:

Wall mounted HRV fresh air fans generally have the best effect when matched with negative pressure exhaust fans. Install a negative pressure exhaust fan in the bathroom of your home to use with the wall-mounted machine, which can discharge the polluted air in the whole house in time and realize the free breathing of the house. In fact, there is no absolute difference between ceiling-mounted, wall-mounted, and wall-mounted fresh air fans. We should choose according to the needs and application scenarios. But no matter which type of fresh air product you choose, you must comprehensively consider its air volume, sound noise, purification capacity, heat exchange rate, and of course the price!

In-Duct Air Purifiers

KCVENTS In-duct air purifiers, also known as “in-line” air purifiers, are a type of air purification system integrated into the house or business’s existing HVAC ductwork to clean the air in your home. Read on to learn more about your options for in-duct air purification.

What Is an In-Duct or In-Line Air Purifier?

In-line air purifiers are air purifiers installed entirely within your home or business’s existing ductwork. Your system (furnace or air conditioner) must be running to benefit from this type of air purifier.

These systems do not simply filter the air—that step has already been taken care of by your HVAC system’s internal air filter. An air purifier neutralizes dust, dander, dirt, pollen, and germs using the power of UV light and ionization technology.

How Do In-Duct Air Purifiers Work?

There are two key types of in-duct air purifiers: 1. UV air purifiers and 2. Ionization air purifiers. In-duct air purifiers purify the air or ionize the air as it passes through ductwork. Do in-duct air purifiers work as well as portable air purifiers? Absolutely – they work as well if not better than most portable or in-furnace models.

In-duct air purifiers are highly effective – choose the model that’s right for your property.

UV Air Purifiers

You’ve heard that sunlight can kill germs, right? UV air purifiers aim to replicate this process in a closed and controlled environment using UVV and UVC rays. A UV air purifier uses UV rays to neutralize harmful particles that pass through the air duct. Because air streaming through a home’s ducts has already passed through a filter, this method is predominantly used to neutralize germs, odors, and very small particles that can pass through a common HVAC filter.

Ionization Air Purifiers

Ionization air purifiers clean the air by electrically charging air molecules so that they bond with positively charged particles—including dirt, dust, smoke, soot pollen, and germs. When the particles bond, they become heavy and fall on to the ground or a nearby surface, allowing them to be swept or vacuumed up over time.

Extended Media Filters

All furnaces come with a pre-installed filter designed to catch large particles in the air as they move throughout the HVAC system. An extended media filter is a thick set of specially designed MERV-rated filters, installed in-duct, that enhance the filtration powers of your existing system.

Extended media are considered passive air filters and come in a variety of makes and models. Many use polarized media to capture electrically charged particles in the filter.

Which In-Duct Purifier Is Right for Me?

When selecting the right in-duct air purifier for your home or business, think about what’s most important to your overall air purification goals. UV air purifiers may be preferred where neutralizing germs is the key goal. Ionizers are ideal when the main concern is with allergens: dust, dander, and pollen particles in the air.

These systems also work well together. In fact, many decide to install both systems and a combination unit, to thoroughly clean the air in their property.

Activated carbon has swept through the modern world and become an essential component in an enormous range of industries, including medical, cosmetic, and agricultural applications. This versatile ingredient is also a crucial component for the best water filtration systems.

How Activated Carbon Filters Work

Carbon’s effectiveness is largely thanks to its incredible surface area.

Physical adsorption is the main way in which activated carbon filters out a given substance. As liquid or air comes into contact with activated carbon, intermolecular forces draw molecules into the millions of pores and pockets on the surface of activated carbon.

Beyond physical adsorption, activated carbon also facilitates chemical reactions. A common example involves chlorine molecules. When chlorine comes into contact with activated carbon, both molecules react to form chloride ions, effectively removing chlorine from water.

The amount of contamination that activated carbon removes from the air or water depends on many different factors, including the type and amount of pollution, the acidity and temperature of the water or air, and how long the water or air spends in contact with the activated carbon.

The specific type of activated carbon also determines the level of filtration provided. Carbon molecules with large holes trap big and heavy molecules such as the ones found in organic chemicals. Small, fine pores pick up smaller and lighter contaminants. Manufacturers of activated carbon often label their products by their adsorption potential.

While activated carbon is safe to ingest, no trace of carbon is left in drinking water after it has been properly and thoroughly treated.

To fully explain every application of activated carbon would take volumes, so we’ve condensed its many uses into several broad categories:

• Medical Applications — Activated carbon is widely used in the medical community to treat overdoses and poisoning. Additionally, activated carbon capsules or tablets can be purchased around the world to alleviate problems like indigestion and diarrhea.
• Industrial Applications — Activated carbon is used in a broad range of industrial and manufacturing contexts. One common industrial application is in metal finishing. Activated carbon is the primary purification agent for removing impurities from metals like nickel.
• Analytical Chemistry Applications — Because of its high adsorption, activated carbon is often used to purify solutions of organic molecules and chemicals. When combined with diatomaceous earth, activated carbon acts as a stationary phase in the low-pressure separation of carbohydrates.
• Agricultural Applications — Activated carbon has risen in popularity with organic farmers and vintners. In livestock production, activated carbon serves as an additive to animal feed, a natural pesticide, a processing aid, and a disinfectant. For winemaking, it is a processing agent that absorbs odor and undesirable color pigments.
• Environmental Applications — Because of its high surface area and adsorption potential, activated carbon serves a wide range of environmental uses. It is useful in groundwater remediation and spill cleanup.
• Cosmetic Applications — Activated carbon is now a popular ingredient in shampoos, toothpaste, and face masks. The same properties that make activated carbon a wonderful filter make it excellent in cosmetic contexts. It traps toxins and contaminants so they can be washed away.
• Distilled Beverage Purification — In the manufacturing of whiskey and vodka, activated carbon filters are sometimes used to remove organic impurities from the beverage. Activated carbon filters out impurities that affect taste, color, and odor without reducing the alcohol content of the drinks.
• Water Purification — Water purification is a major use of activated carbon. Activated carbon filters are used in both large- and small-scale products. They can remove impurities from large-scale, community-wide water systems as well as smaller scale, residential applications.
• Air and Gas Purification — Activated carbon filters out odors, pollutants, and volatile organic compounds (VOCs) from the air by trapping gas molecules and removing them efficiently from circulation. Also, activated carbon can be used to detect and adsorb radon in the air. In gas purification, activated carbon filters remove odors, hydrocarbons, and oil vapors from the air.
• Mercury removal — Mercury is a common and hazardous emission of coal-fired power plants or industries. When infused with halogens or sulfur, activated carbon traps mercury gas and removes it from the air.
• Gas storage — Activated carbon’s porous surface acts like a sponge for many types of gases. Research suggests activated carbon can store fuel gases efficiently in low mass, low volume, and low-pressure environments.
• Space Technology — Activated carbon is an essential component in the life support systems of spacesuits. The activated carbon filter removes trace contaminants from the flow of oxygen to the astronaut, including body odors.

Activated carbon filter You Can Trust

Activated carbon has revolutionized a wide range of industries, including air purification. KChydro has revolutionized activated carbon.

Carbon air filters are the filters most commonly used to remove gases. They are designed to filter gases through a bed of activated carbon (also called activated charcoal) and are usually used to combat volatile organic compounds (VOCs) released from common household products. They are also often used to remove odors from the air, such as the smell of tobacco smoke. They cannot remove fine particles like mold, dust, or pollen from the air.

Activated carbon air filters remove pollutants from the air with a process known as adsorption. Note that this is different from absorption. In absorption, the substance you want to remove (let’s say water) is absorbed into the structure of the absorbent (like a sponge), but it doesn’t become a part of the absorbent on a molecular level. Therefore, when you absorb water with a sponge, the water does not become chemically bonded to the sponge. It just fills in the spaces inside it.

Carbon filters on the other hand use ad-sorption, not ab-sorption. The key difference here is that during adsorption the pollutants stick to the outside of the carbon. Whereas with absorption, the pollutants are absorbed inside the structure itself–as with the sponge.

Carbon is a lattice of carbon atoms connected to each other. The activation process is so important because the increase in surface area gives gases a greater area to stick to. When a molecule of some gaseous substance comes through the carbon, it can stick to the surface of the bed, provided there is an open adsorption site.

The process of adsorption allows carbon air filters to filter organic chemicals (gases) from the air. The problem with the activated carbon bed is that over time, the gaseous pollutants increasingly fill up the adsorption sites of the activated carbon. Once the bed is saturated, the filter can no longer trap pollutants. In fact, chemicals with a greater affinity for an adsorption site can displace those with lesser affinity, and the affinity of a given chemical for the sorbent is highly dependent on ambient conditions such as temperature and relative humidity. So, as conditions change, different chemicals may be released from the filter. When a carbon air filter is saturated, you might notice it giving off a strange odor. This is a strong indicator that it’s time to change your carbon filter.

How to effectively use an activated carbon air filter

Carbon air filters can be an important part of your home air purification system, but they have to be used correctly.

• Make sure it uses enough carbon. Some filters claim to be activated carbon filters, but they use only a trace of carbon. These will not be effective because they become saturated almost immediately. A rough guideline is that a good activated carbon air filter uses at least five pounds of carbon–of course, not all carbon is created equal, and some may have more binding sites (and saturation capacity) than others. But, generally speaking, the more carbon used, the more effective it can be because there will be more sorption sites to stick to.
• Air flow is vital. To remove the most pollutants possible from the air, the air needs to spend the maximum possible amount of time passing through the carbon. In the air filter industry, this is known as “dwell time.” A filter with a good amount of carbon of sufficient thickness and high dwell time is going to be far more effective than a filter with a thin layer of carbon.
• Change your carbon filter. Once the carbon becomes saturated, it loses all effectiveness as an air filter. It is imperative that you change it out for a fresh carbon filter when this happens. The problem is that there is not a perfect method of knowing when carbon is saturated. Sometimes you will notice the smell; sometimes you will not. You can follow the manufacturer’s guidelines and change it on a regular basis, although this is just a rough estimate. The carbon becomes saturated depending on how heavily it is used and the amount of pollutants it is exposed to. Replacing carbon filters is a costly investment, but a monthly replacement schedule is a good starting point.