What humidifier is better: how to choose the optimal device

you can learn from this article, a humidifier is better, and how to choose the most practical and effective model. Here, the basic criteria according to which it is recommended to carry out device selection for humidification: technical indicators optimal equipment, the most reliable and high-quality manufacturers in the market of household appliances, demand patterns, prices and reviews on them consumers.

What humidifier better basic criteria Device Selector

Thanks to modern technology, comes to the market high quality and functional equipment, which is designed to improve the quality of human life. Humidifiers are designed not only to maintain a comfortable humidity level, many of them effectively purify the air and prevent the spread of dangerous bacteria to humans.

The shops offer dozens of manufacturers and a variety of models, so the majority of customers are lost at the sight of such a change. There are a number of criteria, which will determine the choice of a suitable device and choose the best device for specific operating conditions:

• type humidifier - moisturizers, climate systems, uvlazhniteli-cleaners ( "Air wash");
• humidification speed;
• filtration system;
• type humidifier (on the basis of the work);
• service area;
• power level;
• Receive water tank;
• noise level;
• additional functionality;
• manufacturer.

Note! In qualitative models present multistage purification system consisting of several filters for various purposes. This applies to the complex type humectants such as "air wash" or climate systems which operate other than moistening cleaning function.

How to choose a humidifier for the house specifications

Speed ​​humidification depends on the performance of the device, its power and size of the room. With the expectation of this device should be selected.

performance choice for the size of the room:

Area, m²	Productivity (breathability) m³ / h
15	45
20	60
30	90
50	150
80	240

Power modern humidifiers It is in the range of 20-300 watts. The larger the room, the higher should be the figure. When you purchase is worth remembering, too powerful devices consume large amounts of energy.

The area of ​​service specified by the manufacturer directly to each model. The humidifier must be chosen taking into account the size of the room, where it will be used. As practice shows, not always declared by the manufacturer corresponds to the actual power of the device capabilities. This nuance noticed many consumers who already bought a humidifier reviews on this topic on the net enough. For this reason, it is recommended to select a device with a small excess of the required index.

capacity choice of size of the room:

Area, m²	The volume of the water tank, l
15-20	4-5
30-40	6-7
50-60	8-9

How to determine the level of noise exposure:

Noise level dB	Manifestation
10	whisper
20	normalized noise indicator for indoor residential type
40	quiet
50	average volume
60	loudly
70	very noisy

Note! Noise level - one of the most important indicators. If it is exceeded, the person may experience discomfort while in the same room with a working instrument, especially at night.

What are air purifiers, humidifiers for home better choice of filtration systems

Manufacturers of HVAC equipment use different types of filters.

coal - effective and easy to neutralize smoke, odors and harmful to human chemicals out of the room. By cons include limited lifetime, because the filtration system must be replaced in a strictly specified by the manufacturer as possible. If you do not, begin to accumulate within the bacteria and harmful microorganisms. Often they are used in conjunction with other types of filters.

HEPA - the system performs fine purification, with which the removal of virtually 100% dirty impurities and harmful substances. This type of filtration systems used in medical devices establishments. There are two varieties - washable and replaceable. Maximum period - 1 year. This type of filter has a high cost.

photocatalytic - purification efficiency of 95%. The cleaning process involves not only removal of toxic substances from the water, but their further oxidation and decomposition. Implemented cleaning air from gases, harmful bacteria and impurities. These filters have a long service life.

ultraviolet - remove bacteria from the air and fungal spores. This type of filter does not need special care and treatment.

Ionizing (electrostatic) - directed to capture the charged particles. Copes with air purification function of soot, dust, but can not eliminate toxic substances. Most often, these filters are used in conjunction with others. These advantages include low price. Reusable.

primary purification - able to remove air from the only large dust particles and dirt fragments. The filters can be cleaned with a vacuum cleaner or rinse water.

Which is better to buy a humidifier for maximum comfort: additional functions

On sale there are moisturizers with improved functionality. Such designs are capable of performing multiple functions and maintain the air in an optimum state for human beings. ionization option improves the quality of cleaning in the house. Due to particles with a negative charge occurs dust settling. To remove it, is enough to make wet cleaning or vacuum the floor. Buy ioniser and a humidifier for the house can be almost any store of HVAC equipment.

Note! Devices acting simultaneously as ionizer and a humidifier for the home, prevent the growth of bacteria in the air.

Devices with optional ozonization disinfect the air in the room. Some humidifiers provides the function of flavor. In a special container is added to a natural essential oil, through which humidified air acquires a pleasant aroma.

There are wetting and additional functional:

1. The ability to customize the intensity of moisture - With this feature, the user can change the intensity of moisture, if necessary.
2. Hydrostat - at the expense of the add device can control the level of humidity in the room and off as required. Switching off takes place automatically as soon as the humidity reaches the norm. In many steam humidifier is not a feature that is not very convenient.
3. Ability to adjust the direction of flow - the user can manually set the device so that moist air streams were directed into a specific direction, for example, flowers or away from outlet.
4. Adapter for a vehicle - a device used to maintain normal levels of humidity in the car. As the power supply applied lighter.

What are humidifiers: types of construction works on the principle of

According to the principle of operation distinguish the following types of structures:

• steam;
• ultrasound;
• traditional.

Additionally commercially occur more functional and powerful devices, such as climate systems and "air wash". They have a wide range of possibilities.

Traditional moisturizers or cold evaporation include three components:

• a liquid reservoir;
• fan;
• porous filter cartridge type.

Filter and the water tank are connected so that the filtering system is immersed in water. In this zone enters guide air fan, which enhances the evaporation process.

The principle of operation of ultrasonic humidifiers is in the oscillatory motions of the membrane moistened with water. The frequency of these movements is very high, whereby the fluid breaks up into tiny water particles, moistening the air. In the upper part of the housing is all the electronics, such as lights, a hygrometer, and the water tank. The lower part is usually arranged all circuit ultrasonic humidifier and the components providing the air flow direction and the fence.

Note! We do not recommend to clean ultrasonic devices. This can cause damage to important parts of the device. To buy ultrasonic transducer for air humidifiers (membrane) is required to order the item and it does not make a mistake with her choice. Minimum radiator will cost 200 rubles.

steam type devices operate in exactly the same way as electric kettles: located at the bottom of the heating element, through which water boils and evaporates. In some devices, there is an indicator showing the quantity of liquid inside.

How to choose and buy cheap air humidifier

inexpensive humidifiers can be selected in each category of devices at a reasonable cost for a majority, taking into account functional, which they possess.

Virtually all model Polaris Humidification budget can be attributed to variations. This technique has a tolerable quality considering the price requested by the manufacturer.

According to the reviews, Polaris PUH 5806 DI humidifier can be placed on the first line rating cheap devices having acceptable quality. The device is equipped with touch-type control, and a built-in hygrostat. Working area - 35 m². When the value of 2990 rubles. this version of the humidifier can be called one of the most affordable in price, although his power is not as high as others.

In accordance with the feedback humidifier Vitek VT-1761 BK ranked from the point to the second. The construction other than the basic functions include antibacterial filter and an integrated ionizer covered by area - 40 m². The price of this humidifier 3000 rubles.

Third place went to Polaris PUH 2650. Coverage him much less - 24 m², there is a function setting humidification intensity. The humidifier is able to operate continuously for 12 hours. unit cost - 3200 rubles.

In the TOP best humidifiers with a small cost of the fourth line is Ballu UHB-255 E Hello Kitty. It has an attractive design, is able to work for 8 hours. The device is equipped with a timer and cartridge, softening water, calculated on an area of ​​20 m². Its price is 4000 rubles.

humidifier Bork H501 got fifth place. In the device several convenient operational modes provided:

• SPA;
• Heated steam;
• baby;
• auto;
• night.

Note! At a price of 10,000 rubles. Bork device offers a very high functionality, so this cost is justified and is not considered excessive.

Humidifier covers an area of ​​60 m² and is able to work without additional charge over 10-12 hours.

Related article:

Humidifier: benefit and harm, reviews, opinion of doctors on the use of instruments

The problem of dry air in the room and different ways to solve it. Drawbacks and advantages of domestic humidifiers.

Ultrasonic or steam humidifiers, which is better: the advantages of devices

To determine which is best humidifiers, steam or ultrasound, should consider in detail the advantages and disadvantages of each type of device.

Advantages of the steam-type appliances:

1. The apparatus can be operated without the use of consumable materials (filters, emollients cartridges, etc.).
2. At the exit vapor has perfect purity matter what the composition and quality of the liquid poured into the container.
3. Depending on what type of device is filled with the mixture, a humectant may function aromatic lamp or inhaler.
4. This type of device has the highest reserve capacity - about 700 g / h.
5. Provided humidity over 60%.

For added safety, many manufacturers provide devices in the steam mechanism automatic shutdown if the container lid is not closed tightly enough or the water in the tank I ended. Steam humidifiers difficult to overturn.

The advantages of ultrasonic designs:

1. humidifier escaping vapor is not hot and cold, so it is completely safe for humans.
2. Low consumption of electrical energy.
3. Design equipped with a built-in hygrostat, for this reason the device can independently control the level of humidity in the normal range, automatically turn on and off when it needed.
4. In many versions it has light indicators showing the degree of humidification.
5. Compact dimensions and very low levels of noise exposure.
6. The design of the atomizer is rotated, thereby accelerating the spread of water vapor in the air and to ensure its uniform distribution.
7. In operation, a "warm vapor" is performed disinfection of water, and the destruction of microorganisms and bacteria.
8. Optional automatic shutdown in case of total water consumption.

How to choose a humidifier, steam or ultrasound: Device disadvantages

Disadvantages of steam devices:

1. Violation of the rules of safe use could result in burns. This problem is especially relevant for families with young children.
2. The high level of energy consumption.
3. In constructions offline humidistat for controlling the liquid level in the tank.

Note! For operating the device to constantly monitor. If time does not fill with water, the unit can burn.

Disadvantages of ultrasound devices such as:

1. The purity of steam depends on the quality of filled in the liquid reservoir, more precisely, its parameters: the nature of impurities, their number, severity level. Therefore, for efficient operation of the ultrasonic humidifier require cartridges for water filtration, the replacement of which is carried out every 2-3 months. If the device is used without a filter or with the delayed element, that on the furniture and other surfaces will settle ugly white coating.
2. The relatively low efficiency.

Note! It is difficult to answer unequivocally, what better to buy a humidifier for your home. It all depends on the needs of people and premises.

The conclusion which humidifiers best: steam or ultrasonic

steam type humidifiers are suitable for rooms of large size, which aired very often. This is because the steam devices have a high rate of efficiency. For this same reason, they are ideally suited for air humidification in conservatories and greenhouses, where tropical growing greenery, which needs a large amount of moisture. One should not dismiss such useful features as Aroma inhalation present in steam humidifiers.

Ultrasonic models, on the other hand, are an excellent option for small-sized apartments, especially if young children live in it. Because these devices are safe and produce minimal noise during operation.

To come to a final conclusion should indicate how many there are humidifiers for the home of each of these types.

Steam and ultrasonic humidifiers: rates, reviews

Cost ultrasonic humidifier Polaris PUH 3204 - 2450 rubles. Spaciousness capacitance of this device is 4 liters and a working area of ​​20 m². The device is capable of operating for 15 hours. For safety reasons the unit is automatically turned off if the liquid in the tank runs out.

Dropping an air humidifier Polaris PUH 3204 customer reviews mostly positive:

"An excellent moisturizer for a reasonable price. I have ceased to peel off the skin, shortness of breath problems are gone, and even the flowers look more healthy. All her friends I recommend to buy a humidifier Polaris ".

Christina Malakhov, city Moscow

Note! In this model, there is a ceramic filter that improves the quality of the water that enters the tank.

The feedback humidifier Polaris PUH 6030 type ultrasonic looks no less attractive:

"Technology companies Polaris suits me at all. An earlier version of a humidifier Polaris PUH 4740 I worked for almost 4 years and has fully justified itself. I probably lucky. At this time we decided to opt for a humidifier Polaris PUH 6030. It is compact, inexpensive (only 1000 rubles.), It has a beautiful design and a good job with his work. The only drawback - swinging too long. "

Eugene Shammua, and of Yekaterinburg

Are more likely to appear in the positive responses humidifiers Bork, which combines the functionality of devices and steam cleaners ( "air wash"):

"For a month I use a humidifier Bork H 700. He cost me 15,990 rubles. Liked the beautiful design with mirrored front panel, it looks stylish. The device is almost unheard of. a pair of direction can be adjusted, as well as the intensity of moisture. Very easy to manage and moisturizes well. "

Daria dark, city Moscow

Which is better: "air wash" or humidifiers standard type

Despite the fact that the main purpose of the standard type air humidifier (ultrasonic or steam) and "Air washing" is to perform the same task, the result of data operation units different.

In a room with running a humidifier and air purifier for the house to breathe easily. This eliminates the likelihood of air stagnation or excessive moisture, which often found the owners of conventional devices, especially steam. This is due to the high processing quality.

To identify a good humidifier customer reviews may not be enough, since in each case for a particular room will suit your type of device. However, the "air wash" can be called universal, because of their particular principle of operation:

1. In addition to moisturizing indoor air cleaning is carried out.
2. Device capable hour chase through the filter system the entire volume of air in the room twice, creating its flow circulation.
3. Humidification is performed in a natural way, so there is no need to use special sensors and control automation sensors.

Note! In the "cleaning air" is not such a serious disadvantage, as the uneven distribution of moisture inherent in classical devices. Water vapor is distributed evenly around the room due to the built-in fan.

The best home air humidifiers for each category

To finalize the order, which one is better to choose a humidifier, you need to walk on the most popular models and manufacturers. The best brands The following companies were:

• electrolux;
• BONECO AIR-O-SWISS;
• polaris;
• philips;
• Sharp;
• Shivaki;
• Home-Element;
• Ballu.

What are ultrasonic humidifiers better customer reviews

Below you can see the consumer feedback, which is better to buy an ultrasonic humidifier type air:

"I can not say that it is not noticed shortcomings in respect humidifier Polaris PUH 2204 reviews about this device that I have read previously, were neutral or positive. So I went to the store just for this model. The device liked a lot: the low price, a sufficient level of moisture, leaks and odors. Do not like the lack of automatic shut-off function, it is necessary to control the amount of water in the humidifier. And the process of pouring the liquid is not convenient. But for this price one can hardly find a better option. "

Alan Smyatkin, city Yekaterinburg

"For a long time I could not decide which model to buy. Consulted with friends, browse the Internet. The feedback Polaris PUH 4740 humidifier looked more than attractive. It became the first instrument in my house. The price of 1500 rubles. I completely arranged, as well as the quality of humidification. Although I have little room is small, and may not be suitable for large rooms. No shortcomings. "

Ulyana Nizhny Novgorod, city Omsk

"Keep the proud owner of a humidifier Polaris PUH 4405 D reviews left here on this manufacturer. Of course, technology is not without sin, is noisy, only light indication can be switched off in night mode. However, in its price segment of the humidifier can be called one of the best. The device has excellent performance, user-friendly touch screen. Even in the tank has a handle that allows you to gently remove it. I'm happy with my purchase. "

Roman Steshka, city Moscow

What ultrasonic humidifier best

The best devices for humidifying air recognized model indicated in the table below. In the category of ultrasonic devices they have the optimum combination of performance and merit.

Note! These rankings are taken from the popular forums. The results are based on most of the reviews left by customers.

Ranking of the best types of ultrasonic devices:

Characteristic	device model
ELECTROLUX EHU-5515D	POLARIS PUH 3005DI	BORT BLF-824
Power, W	125	30	80
Operating area, m²	60	30	30
Spaciousness tank, l	6,7	5	2,4
Flow Rate, ml / hr	550	400	300
humidistat	there is	there is	no
directional control	no	no	there is
liquid heating	there is	no	there is
control type	electronics	electronics	electronics
Timer	there is	there is	no
indication of inclusion	no	no	there is
Display	there is	there is	no
Liquid level sensing	no	there is	there is
price, rub.	8640	4000	2969

How to choose a humidifier: reviews, prices of traditional instruments

traditional type devices humidify air in a natural mode. Customer reviews reflect that this nuance has both advantages and disadvantages:

"A few months ago I acquired to special offer humidifier Philips HU 4801/01. I chose it for one simple reason: the lack of limescale on the furniture. The fact that many of my friends complained that after the use of ultrasonic humidifiers on all surfaces in the room are white marks. This is not surprising, because these devices do not evaporate the water and break it down into micro-particles - water spray. Thus, all the salt in its composition, is distributed with the drops throughout the room. So I decided to switch to conventional devices. In this model, I was pleased with even the price - 5000 rubles. Efficiency moisture from Philips HU4801 / 01 is not high, but the result I was quite happy. only the high cost of replacement filters can be called a significant disadvantage. "

Vlad Kuksina, city Moscow

"I want to share my experience of using a humidifier. Bought with her husband Ballu EHB-010 for 3290 rubles. Chinese appliance has several modes of operation. In fact, it proved to be from different parties. Moisturizes slowly, but consumes a lot of energy. There is a built capsule of aromatic oils. We are pleased to use this feature by adding lemon oil unit for air disinfection and lavender to improve sleep. Performs air purification, but only from larger dust particles. If the room is not large, this device would be a good assistant. "

Arina Stechkin, city St. Petersburg

Ranking of the best traditional humidifiers

Often, conventional devices are called humectants cold type, as the water evaporation process is carried out without prior heating.

Note! Most traditional types of models equipped with a filter paper impregnated with antibacterial substances. The lifetime of the element is 3 months. Then you need to implement a replacement.

Ranking of the best devices of the traditional type:

Characteristic	device model
BONECO AIR-O-SWISS 2071	PHILIPS AC 4080	WINIA AWX-70
Operating area, m²	50	30	50
Spaciousness l	8,4	3	9
HEPA-filter	there is	there is	no
Carbon filtration system	there is	there is	no
Pre-cleaning	there is	there is	no
Noise exposure, dB	32	36	32
humidistat	no	there is	there is
Filter water type	there is	there is	no
Ionization	no	no	there is
Water flow rate, ml / hr	250	300	700
price, rub.	29990	27297	24990

Steam humidifiers: what better customer reviews

Steam humidifiers, despite its simplicity, enjoys great demand among consumers. Reviews of some customers:

"I want to tell you about my humidifier BONECO AIR-O-SWISS S450. Like many caring mother, I bought this unit after birth. During the selection process I was interested in a few moments. Firstly, how easy will control. Secondly, humidification efficiency and the lack of white marks on the furniture. Due to its sterile couple and the absence of such complexities as the exclusive use of distilled water, this model has attracted me more than the others. In just a few months of use, I did not notice the shortcomings. Therefore, I recommend everyone to pay attention to this useful and convenient thing. "

Svetlana Mihnevich, city St. Petersburg

"If we compare with other moisturizers I've ever seen, DELONGHI UH 700M is the minimum number of drawbacks. He got to me at the promotional price, which was a nice bonus to the purchase. The device in a short time turns the room into a jungle, has a beautiful design and practical structure. Unfortunately, the heating element is accumulated scum. But the wife decides this question is simple - soak it once a week in the vinegar solution. "

Oleg Fox, city Omsk

Note! Steam humidifiers have a high level of consumption of electric energy in comparison with other types of devices. This is due to a high rate of efficiency. The device is capable of 700 mL per hour to evaporate the liquid into the air.

Which is better to buy a steam humidifier

In the table, placed below shows the comparative characteristics of two models of humidifiers, which are recognized as the best in the category of steam devices for customer opinion.

Characteristics of the best devices for steam humidification:

Characteristic	device model
BONECO AIR-O-SWISS S450	DELONGHI UH 700M
Power, W	480	260
Operating area, m²	60	30
Spaciousness tank, l	7	6,1
Flow Rate, ml / hr	550	300
humidistat	there is	no
Cartridge for water softener	there is	no
control type	electronics	electronics
Timer	there is	no
indication of inclusion	no	there is
Display	there is	no
price, rub.	16800	8400

Best humidifiers purifiers: customer reviews

On sale there are humidifiers with optional purification - "air wash" and climate systems. From conventional devices they are distinguished by the presence of high-quality multi-stage filtration system. Thanks to her, removed from the air is not only larger particles of debris and dust, but also small and harmful substances.

Most buyers respond positively on these devices:

"Air Cleaning Boneco AOS 2071 - truly a quality device that effectively humidifies the air. In this case, no problems such as the deposition of salt on the surface of the furniture. Air purification occurs at the proper level. After its use in the room to breathe easy. Minus the aggregate - the price, but, in my opinion, it is worth the money. "

Igor Svekruhin, city Yekaterinburg

"In favor of the humidifier Electrolux EHAW-6515, I can say the following: The device is well moisturizes the air, easy breathing in the morning, my child disappeared problems with a stuffy nose. With regard to air purification I can not say anything definitely. At the bottom of the pallet are going to the hair, and the water is polluted, so we can assume that humidified air is cleared of large debris. Water tank capacity is large, it can also be called a plus. Personally, I do not have enough flavor features. The device has got a gift, so if she chose her, I would have bought a humidifier with a capsule for the pouring of aromatic oils. While settle for aroma lamp ".

Catherine Khmelnytsky, city St. Petersburg

Useful advice! pre-ionization function that is present in some "air car washes" gets rid of odors, including tobacco smoke. The degree of air purification from substances sometimes reaches 99.97%.

Best humidifiers with cleaning function: rating models

This section focuses on popular models of humidifiers, purifiers of the most high-end brands in the market.

Characteristics of the best moisturizers, cleaners:

Characteristic	device model
FANLINE VE400	SHARP KC-850E	PHILIPS AC 4084
Capacity, m³ / h	160	306	210
Operating area, m²	30	38	40
function of ionization	there is	there is	no
Carbon filtration system	no	no	there is
Flow Rate, mm / h	410	600
HEPA-filter	no	there is	there is
Ultraviolet lamp	there is	no	no
Function air ozonation	there is	no	no
Noise exposure, dB	45	47	50
Spaciousness liquid reservoir, l	8	4
purity indication	no	there is	there is
price, rub.	8400	14900	38989

What humidifiers for home better overview of the manufacturers

SHARP producer devices includes two functions - purification and humidification. The latter of which is not the main and optional. Despite this, the device performs both these tasks at a high level. As a purification system manufacturer uses HEPA filters and deodorizing elements and ionization. Most customer reviews say that humidifiers SHARP justify the money spent.

Dutch brand PHILIPS has manufacturing facilities in China, the Philippines and Malaysia. The main focus of the company is focused on the manufacture of structures of the traditional type, as well as "air sinks."

Note! A characteristic feature of the device is a large variety of modes, an attractive design and a low level of noise exposure.

POLARIS company is present on the market since 1992. During this time, the brand has managed to build a well-developed system of service centers and arranged their production facilities in several countries around the world - Russia, Israel, Italy and China.

The activity of this brand is focused on the production of steam and ultrasonic humidifiers. The company's products has a beautiful design, simple control system and a relatively low cost.

SHIVAKI company is one of the largest manufacturers of electronics and appliances stores. Founded in 1988, this brand has factories in these countries: Russia, Japan, South Korea, France, Hong Kong, Germany.

The company produces a comprehensive range of ultrasonic devices with different capacity. Most models have a function, and cold and warm steam. Some of them even disinfect the air.

Features of operation of air humidifiers: Truths and Myths

Dry air has a negative impact on human health, gradually speeding up the process of destruction. Prolonged exposure to dry air man is faced with such negative phenomena as:

• eye irritation - particularly the problem affects people who wear contact lenses;
• dry skin - as a result of skin sensitivity increases, cracks may appear on the hands. Also affected by internal processes in the skin, for example, lipid metabolism and balance;
• dryness of the respiratory tract mucosa - may worsen diseases such as bronchitis, asthma, tracheobronchitis, allergies. Often there are exiles bouts of coughing at night or in the morning.

Note! Dry air is destructive and furnishings in the house: expensive wallpaper, old books and paintings, parquet flooring, wooden furniture, etc.

Common myths and the truth about humidifiers

The following are the most common error on air humidifiers.

In rainy weather, no need to use a humidifier. The warmer air in the room, the lower the moisture level. Even if the windows of the rain, in order to achieve a comfortable environment - you should still use the device, so as a centralized heating system has a direct impact on the humidity in the room, reducing her.

The house has enough sources which can moisten the air. This refers to such devices as a boil kettle, aquarium or fountain, a cloud of steam from the bathroom after bathing. All of these tools can raise the humidity indicator, but only slightly. Without a humidifier in the home can not do.

In winter, there is no need for humidification. In cold weather, the air in the apartments need is particularly acute in the moisture, because the battery significantly reduce its amount.

The humidifier can be harmful to health. This myth involves ultrasonic devices, but emit an oscillatory motion of the membrane absolutely harmless to human waves, so they can be safely used in the presence of children and animals.

It is worth noting that whatever moisturizer, its presence can not replace the ventilation of the room. This procedure should be performed regularly to keep the air in the room remained fresh, and the climate - comfortable for people.