Calculation of the thermal curtain: the formula for calculating the performance of the thermal curtain

Advantages of water-type thermal curtains

Firstly, such curtains consume a minimum of energy, "feeding" from the heating circuit of the warehouse heating system.
Secondly, such curtains stabilize the temperature in the protected room, creating ideal conditions for storing the most "capricious" inventory items.
Thirdly, water curtains not only protect, but also heat the entrance to the warehouse.
Fourthly, thermal curtains neutralize the appearance of drafts, improving the working conditions of warehouse personnel.
Fifth, such curtains can be modified by turning them from a heater into an air conditioner. Moreover, such a transformation is carried out by disconnecting the curtain circuit from the coolant circulation system in the heating system. After that, the curtain begins to work like a huge fan, air conditioning both the warehouse entrance and the storage itself.

That is why the scope of application of water curtains can be the widest, extending from thermal shielding of the thresholds of large warehouse openings to protecting the interior of a store or cafe from dust and insects.

Ways to improve efficiency when using air curtains

First of all, the heat curtain must be selected in such a way that its technical parameters correspond as much as possible to the conditions in which it will be operated (height or width of the doorway, air capacity and direction of its stream, thermal power, in the case of air heating, etc.). etc.).

A correct assessment of the paths of air intake into the room makes it possible to see ways to improve the efficiency of the operation of air-thermal curtains. This process must be agreed between the manufacturer (designer, installer) of the air curtains and the consumer. Indeed, in some cases, for the most correct operation of the device, it is required to make changes to existing building structures.

So, firstly, the adjustment of the heat curtain should be provided:

the temperature of the air flow out of the curtain should vary depending on the temperature in the doorway;
the directional angle of the air flow must be changed in order to be able to adjust it to a specific object (height of doors, gates).

If unregulated heat curtains are used, then when selecting them, it is necessary to give preference to the following types of them (in order of decreasing their efficiency):

thermal curtains with vertical supply (bottom);
lateral, located on both sides of the opening;
upper curtains (above the opening);
one-sided, lateral.

The angle of direction of the air stream coming from the curtain is regulated in each case separately, depending on the air intake from the street.

In cases where the object is equipped with a gate with sliding leaves, it is advisable to install side two-sided or one-sided curtains (to use the effect of the overlapping stream). In this case, the placement of a thermal curtain over the opening is not so effective, since during the opening process of the gate, the curtain runs "idle" for some time.

The thermal curtain must not operate with the door closed. In this case, the probability of heating the doors themselves and heat losses through them is created.

It is advisable to provide for the presence of stationary or articulated vestibules. Energy losses in this case are significantly reduced.

If the height of the door is equal to the height of the ceiling, then flexible ceiling screens are desirable. A ceiling with "pockets" is preferred.To allow warm air to circulate and return to the working area.

Particularly noteworthy are two-jet (combined) air curtains with good damper properties and low energy losses caused by the release of heated air from the room (Fig. 3). Such a curtain is a structure that has two vertically installed transfer boxes with power units (or one power unit for two boxes) supplying warm air. Two boxes located closer to the opening provide unheated air supply. The efficiency of thermal curtains increases when they are installed in a vestibule with a special wall configuration, thus providing counter currents that prevent the penetration of air from the outside.

Fig. 3. Working diagram of a two-jet thermal curtain with a vestibule:1 - power unit (heater and fan); 2 - box supplying heated air; 3 -box supplying cold air; 4 - vestibule

In preparing the article, materials from books were used: V. Karadzhi, Yu. Moskovko “Ventilation equipment. Technical recommendations for designers and installers ", V. Ananiev, L. Balueva, A. Galperin and others." Ventilation and air conditioning systems. Theory and practice".

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Air heating is used to maintain a comfortable temperature inside residential, public or industrial buildings in cold weather. The principle of operation is as follows: a heating element is inserted into the ventilation system, which heats the passing air. There are three main types of space heating systems:

infrared;
conventional;
air.

The latter type includes thermal curtains.

The main structural element of this heating equipment is an air duct that ensures a uniform flow of flows. The guide plates attached to the duct can change the direction of the jet at an angle to the plane of the opening. The heat curtain also has other required elements:

heating element;
fan or fan system;
air filters.

How to calculate an air and electric heat curtain

Most often, systems are found where there is a large number of people. Usually these are cafes, restaurants, shopping centers, industrial premises, warehouses, educational buildings.

Reference! This thermal system is needed to provide a constant certain temperature in the room.

To select a device, you need to calculate it.

In the process of calculations, parameters such as dyna, power and air flow rate are considered.

To find the most optimal length, it is very important to take into account the dimensions of the doorway. The main dimensions are the indicators of the width and height of the opening. The closer the curtain is to the door, the higher the efficiency of its work will be.

We suggest that you familiarize yourself with How to choose an external temperature sensor for a heating boiler

Power

Power calculations are rather subjective based on the metrics used. The technical characteristics of each model include a point about the temperature difference between the blown and blown air passing through the device.

From how correctly the calculation of the air flow rate will be made, we can talk about the efficiency of the system's operation. Basically, quality work depends on the location of the device, and more precisely, on the correct height. Incorrect calculation will lead to the impossibility of efficient operation of the system.

Important! It is better if experienced professionals are engaged in the selection of the air flow rate.

After all the required parameters are calculated, you can proceed to the next step, namely, the selection of the type of system, based on the following characteristics:

Installation type.
Control method.
Heat source.

In order for the curtain to serve for a long time and efficiently, it is necessary that all calculations are carried out correctly.

Electricity, air and water are the main sources on the basis of which the device operates. The most popular options are air and electric heat curtains. And it is about them that will be discussed further.

An electric heat curtain is a mains powered device. Most often it can be found in industrial and domestic premises. It differs in that it has several power switching modes. During the summer months, the appliance can be used to provide a cool air stream.

Air curtains are mainly used to divide the space of the used room. This system does not have heating elements that are built into other types of systems. Their work is based on the rotation of large fans. The air currents created by the blades contribute to the division of space into temperature zones. Most often used in warehouses or industrial premises.

Since the above types are subspecies of this thermal system, the calculation and further selection is carried out according to the same parameters:

length, which is calculated based on the size of the doorway;
power of the device;
air flow rate.

And if the first two parameters are mainly important for calculating an electric curtain, then the latter is a very important indicator when calculating an air curtain.

In order to correctly calculate the heat flow rate, it is best to invite a specialist. Air performance is the main parameter. The flow rate and the height of the curtain installation depend on this indicator.

For example, in order to effectively protect a doorway with a width of 0.8-1 m, the height of which is 2-2.5 m, it is necessary to install a curtain, the air capacity of which is 900-1200 cubic meters / h. At the exit of the curtain, the air speed will be from 8 to 10 m / s, and near the floor - 2.5-3.5 m / s.

The selection of equipment with the required air flow rate is based on the following data:

there is a recommended installation height for each model, but in specific cases it is imperative to take into account the strength of the wind and drafts, and make the appropriate corrections. This is especially true in rooms that have a large area and several entrances and exits;
the air flow rate from the curtain opening directly depends on the rotor diameter and its rotation speed. The rotor length more than 800 mm is not used, as it is difficult to solve technologically. If the curtain is large, the motor is installed in the middle, and the rotors are on the sides. Thus, the cost of equipment is reduced, but there is a dip in the air flow in the center;
manufacturers indicate the distribution of air flow rates at different distances from the installed equipment. It is not recommended to install a curtain that generates too much air flow, as this will lead to large losses of warm air;
the calculation shows: in order for this equipment to work normally, the outflow velocity at floor level must be greater than 2.5 m / s.

We invite you to familiarize yourself with the air-to-air heat pump and its prices

How to calculate the structure

Outside cold air enters the building due to different pressures inside and outside the building. The volume of air supplied by the curtain must completely exclude the penetration of cold air inside.For correct calculations, you need to know the following: the size of the gate, the amount of outside air that enters through the opening without a curtain, the temperature inside and outside the room.

Dimensional drawing of the heating unit

There are several formulas for this calculation. Here are the ones that, according to experts, are the most accurate:

With the formula VHB = L, you can find out the air flow that enters the room (L), if you multiply the speed of the air mass (V), the height (H) and the width (B) of the gate.
The following formula calculates the air flow required to completely block and prevent the passage of cold air masses through the gate or opening: L / J (B / b + 1) = Z.
L-flow rate of air that enters the room.
J-coefficient (0.45) of the air curtain range.
B is the width of the gate.
b - width of the slot for air supply to the curtain.

Choice of a thermal curtain. How heat curtains work

A heat curtain is a heater that generates a stream of warm air. For this, a fan and a heating element are provided inside it. Some association with a fan heater suggests itself, and this is true, since these devices are structurally similar. They differ only in purpose, which will be discussed further. Otherwise, they have an identical design and serve to generate warm air.

If a conventional fan heater simply expels the heated air masses into the room, heating it, then the heat curtain performs a slightly different function. Its task is to create a falling air flow that prevents the ingress of cold air from the outside. This is true in entrance areas, where people often slam doors and drive cold into warm rooms. The heat curtain, generating heat, mixes it with cold air masses and neutralizes their effect.

The principle of operation of the unit itself is as simple as three kopecks. The fan installed inside captures cold air and drives it through the heating element, after which it is sent down. Opening the doors, people drive cold air masses into the room, which subsequently enter the heat curtain and heat up. It should be noted that the air temperature under the device itself is quite high, it is not very comfortable to be in this zone.

The thermal curtain is a reliable and convenient device that provides high-quality protection against many adverse external factors.

Other features of air curtains:

Provide protection against the penetration of insects - they are simply knocked down by tight air currents;
These heat heaters can work as conventional fans;
Some curtains are equipped with an air filtration function, making the atmosphere in the house healthier;
The presence of thermoregulation - if you choose a heat curtain with a thermostat, it will regulate the air temperature in the heated zone and save energy.

Now you know how the heat curtain works and what it can do.

Types of air curtains

How to choose the right thermal curtain? All existing models can be classified according to the installation method and the type of coolant.

By installation type

Today there are three types of air-thermal curtains:

Horizontal. Classic performance. Installed directly above door (window) openings. As a rule, these are small economy class models with a capacity of up to 5-6 kW;
Vertical. Install only vertically to the side of the opening. This installation method is chosen when, due to one reason or another, horizontal installation is impossible or inconvenient. Today on the market of climatic equipment there are design models of vertical mounting, issued in the form of columns;
Embedded. They are characterized by the fact that the body of the device is completely hidden under the false ceiling.A directed air stream exits from a nozzle hidden behind a decorative grille.

Horizontal and vertical installation
Recently, on the Russian market of climatic technology, one can find universal thermal curtains that can be installed both horizontally above the opening and vertically to the side of the opening.

By type of coolant

Depending on the method of air heating, all air curtains are divided into three groups:

Gas;
Aquatic;
Electrical.

Gas air curtains heat the air by burning propane. This is a rather specific equipment that is installed in large enterprises with a huge traffic during peak hours. Such systems are not used in rooms with an area of less than 60 m2. They are characterized by high efficiency, cost, operating costs.

Air-heating curtains are chosen when there is good access to the hot water or heating system. The principle of operation of the equipment is as follows: hot water from the system passes through a heat exchanger, which is blown by a turbine. Due to the difficulties with the supply and availability of the coolant, there are no budget class models among the water curtains, up to 1 m long.

The main advantages of such models:

minimum power consumption;
low noise level during operation;
affordable price;
long service life;
high technical characteristics.

Electric air curtains are very popular among our compatriots. The equipment can be used in almost any conditions: from small windows and doors (models up to 2.5 kW) to industrial gates. Main advantages:

the availability of the coolant;
simple control.

The disadvantage is the significant consumption of electricity during operation.

Installation method and choice of curtains

Requirements for the organization of curtains are formulated in SNiP 41-01-2003 "Heating, ventilation and air conditioning", section 7.7. Most air curtains are designed for horizontal installation above a door or window opening. In this case, the curtain itself is located horizontally and the flow of air leaving it is directed downward. Such a curtain is called horizontal.

Sometimes such an installation is impossible or impractical, for example, with a very high opening height or if the doors open vertically upwards. In such cases, vertical thermal curtains are used, which are installed on the side of the opening. The air flow will then be directed horizontally. The height (length) of the vertical curtain must be at least 3/4 of the height of the protected opening, in all other respects the curtain is no different from the horizontal one.

By design, air curtains are divided into built-in and outdoor versions. Built-in thermal curtains are designed for installation in a suspended ceiling or box, while outdoor curtains are simply mounted over a serviced doorway.

It is very important to correctly identify the type of air curtain you need. The determining factors here are the width of the doorway, the height of the installation and the air flow rate.

Experts suggest using the following simple tips:

the higher the opening, the higher should be the speed of the air flow leaving the curtain; the air curtain should cover the entire doorway in width, so its length should be no less than the width of the opening, and be located as close to the opening as possible. The air flow rate of the horizontal air curtain must be high enough to reach the floor

In this case, the flow should be directed vertically or slightly inclined towards a room with cold or polluted air; in large openings, it is necessary to install several air curtains in one line and close to one another, creating a continuous air flow; in rooms with a large internal volume and several entrances and exits, it is imperative to take into account the effect of wind force on the drafts that occur in the building; it is important to choose the correct flow rate.A low-power air curtain does not cover the height of the opening, and a too powerful flow leads to a leak of warm air; a necessary condition for the normal operation of the curtain is that the speed of the air flow leaving the curtain at the floor level must be at least 2.7 m / s.

With the same dimensions, the heat output of the curtains can be different and is selected from the following considerations:

the need for additional or main heating of the room (vestibule);
the location of the curtain installation and the mode of operation of the doorway (location at the door opening to the street, in the vestibule or from the side of the heated room, the frequency of door opening). So, when working on an open opening, from 50 to 70% of the power of the thermal curtain can be lost;
availability of a source of electricity (or hot water) of the required power at the facility. The operating parameter of the curtain, such as the increase in air temperature when passing through the heating elements, is closely related to the thermal power. The higher the temperature rise, the shorter the time it takes for the curtain to heat a given volume of air. For curtains with electric heating, the temperature rise is from 8 to 35 ° С, for water curtains - up to 40 ... 50 ° С.

When determining the cost of installing curtains, the following points should be taken into account. First of all, the object should be inspected and measured in the required volume, and this service is provided to the customer free of charge. The cost of installation is minimal when the curtain is attached to a solid monolithic wall and special fasteners are not required, and the power cable of the required cross-section is brought to the installation site. The cost of installation increases when it is necessary to lay the power cable from the curtain to the electrical panel, lay the cable in a groove or box, fix the curtain on special metal structures - wellers, corners, brackets, hangers, which sometimes still need to be made.

The editors are grateful for their help in preparing this article.

Air curtain classification

Depending on the design, all air curtains can be subdivided into

Water curtains. Only hot air is supplied, for which the system uses a two-way heat exchanger to heat it. This main part is made of copper pipes with aluminum fins. Of the undoubted advantages of water curtains, one can note the super-economical consumption of electricity, which is consumed only for the operation of the fan blades. Most often they are produced in a ceiling side version, but you can find a more complex configuration (in the form of a column or an ellipsoid), they are controlled remotely using a remote control. They can be used in openings of doors and gates, which remain open for a considerable amount of time. Special series allow them to be used for openings with a height of 3-5 meters. Among the disadvantages of water air curtains, it is necessary to note the complexity of installation and the potential danger of freezing of the heat exchanger. Air curtains are produced by such well-known manufacturers of climatic equipment as the international holding Ballu Industrial Group and the Russian research and production association Teplomash;
Electric curtains. They have a wider range of possibilities, since they can supply not only hot, but also cooled air. Models with a heater have a tubular heating element, a spiral heating element or a STITCH needle heater in the design. Tubular heating elements (which are a hollow steel rod with quartz sand, inside which there is a spiral with a high ohmic resistance) are safer, and are also able to painlessly tolerate power surges. Most modern air curtains use ceramic heating elements (RTC thermistors), which are much more durable and more economical than their predecessors.In addition, a thermostat is necessarily provided in the design, which allows the device to be turned off when a predetermined temperature is reached, which makes it possible to somewhat reduce energy consumption.

Air curtain selection criteria

When choosing a thermal curtain, it is necessary to build on the specific conditions, taking into account the following parameters. Curtain size

Curtain size

It is selected based on the size of the opening on which the equipment will be installed, taking into account the fact that the air flow should block it with a certain margin. One should not save on the size of the curtain, since otherwise the formed cracks will increase the unwanted air exchange. It should be borne in mind that the maximum allowable area of the opening covered by one curtain is 12 m2, so sometimes you have to install several devices close to each other.

Air performance

It is this indicator (the volume of air pumped by the unit in 1 hour) that is fundamental for all air curtains. Measured in m3 / hour or m3 / s. The higher it is, the denser the created air gap and, accordingly, the more efficient the operation of the device. Experts recommend in standard situations to use equipment with a capacity of 700 m3 / s to cover an opening of 2.5 meters in height. In all complex and non-standard cases, such calculations should be entrusted to professionals.

Power

When making rough calculations, the following nuances must be taken into account:

whether the curtain will work additionally to heat the room or its task is only to cut off external air flows. It should be noted that the electric heat curtain should not be considered as a full-fledged heating device. In this case, the excess thermal power of the structure will not only lead to significant material costs, but can also become a source of unwanted drafts;
it is planned to occasionally turn on the curtain, or to operate it with a constantly open opening. In the latter case, up to 70% of the power will be lost;
the presence in the room of a protective vestibule, automatically swinging doors, several entrances.

In the general case, in a capital structure, it is roughly based on the calculations of the need for 1 kW of power for every 10m2 of the room. When installing air curtains in refrigerators and freezers, models without a heating function are used.

Control and regulation of air curtains

Controlling the air curtain is necessary to prevent overuse of energy by changing the characteristics of the air curtain according to each situation.

By using appropriate controls in conjunction with auxiliary devices, the customer can adjust the air flow, temperature, to optimize the operation of the heat curtain and avoid air penetration through the doorway.

Basic controllers allow manual adjustment of ventilation speed and heating stages.

Automatic operation: changing ventilation and / or heating depending on the task
Connection to external sensors and / or devices
Turn on internal sensors (temperature, movement, etc.)
Interface connection to automation systems, external on / off, thermostatic control
Internal security programs (protect components and avoid damage)
Door contact, valves, heating medium sensors, etc.

Door contact (magnetic, mechanical) Solenoid valve Frost sensor

For example, if we install a door contact connected to an air curtain, when the door remains closed, the air curtain is turned off, or operates at a low ventilation speed and / or at a lower heating setting, which saves energy.When the door is opened, the air curtain increases the ventilation speed and / or heating stage to protect the doorway.

Another example is connecting an air curtain to a room thermostat. The device will then increase / decrease or stop heating when it reaches the desired temperature.

Techholod has a wide range of controllers from standard manual to advanced automatic functions and an interface for connecting air curtains to automation systems.

In addition, we offer a wide range of accessories: all kinds of supports, room thermostats, door contacts, solenoid valves, antifreeze sensors, etc.

Horizontal or vertical

Horizontal curtains are more traditional, they are installed at the top of the opening, while the air flow is directed downward. Their use is limited, since at present the standard models are capable of covering the opening height of 2-2.5 meters, and non-standard equipment is too expensive.

Vertical curtains provide more room for maneuver. Industrial air curtains for a warehouse most often have a vertical structure. In this case, the curtain is installed on the side of the door or gate so that the air flows intersect with each other, providing the desired result

Considering the model range, it is necessary to pay attention that horizontal and vertical modifications are not interchangeable for all manufacturers, having significant differences in the layout

Sizes and prices

The price of an air curtain most globally depends on the size of the installation. Air openings are subdivided into several subtypes according to their dimensions:

Curtain subtype by overall dimensions	Maximum allowable opening size	Application area
in width, cm	in height, m
mini	80	1,50	Windows of cash registers, kiosks, etc.
midi	120	2,50-3,00	Doorways, openings in shopping centers, garage doors, small warehouses
maxi	3,50-7,00	Gates in warehouses and production halls
powerful and super powerful	8,0-12,0	Large industrial buildings, trade terminals, hangars

Let's consider some of the most popular models from different manufacturers:

Brand, manufacturer	power, kWt	Productivity, m3 / hour	Opening size, m	Installation type	Features of the	Price, rub
Teplomash	103	6-12	Heating water, galvanized steel housing, 14 m air throw	No data, on order
Tropic X410Russia (industrial, maxi)	6/10,5	1800	6,0	Gore / vert	Roller bearing fan, external thermostat, inlet heating elements	16800-20000
6/12,0	1800/2500	4,5	Heating element with ribbing, unheated mode, capillary safety thermostat, remote control with thermostat	20000-25000
Tropic Т105E10Russia (semi-industrialized)	2,5/5,0	700/920	Not more than 3.6	Gore / vert	For permanently open openings or frequently opened	8500-9200
12/24	4600-5200	Up to 3.5	mountains	Interior, elegant design, 3 heating modes	43275
Russia	1,5/3,0	600	3,5	Gore / vert	Gates, roller shutters of workshops, warehouses, doorways of shopping centers. Thermostat, control panel, cold mode	10990-13000
Tropic M6 (midi)	1,5/3	380	up to 2.5	Gore / vert	Stitch elements for heating. For vestibules	5000-5500
Tropic K6 (mini)	0/3/6	300	Less than 2.0	Gore / vert	For kiosk windows and points of delivery of goods. Can be used as a fan heater with floor standing installation. Control directly on the device	5000-5800
TeplomashKEV-2P1120E (mini)	2,0	350	No more than 2.2	mountains	Can be used as a source of additional heating	3300-7500
(mini)	1,5/3	300	No more than 2.5	mountains	Stitch elements for heating, control on the device, no thermostat	3500-4000

Curtain control

The heat curtain can be controlled using the remote control, which can be remote or built-in.

The specified equipment must have at least two switches that enable the heater and fan to be turned on. More expensive models have the ability to stepwise control the power of the heater and the fan speed.

This equipment can be controlled using a remote or built-in control panel. Usually small air curtains have built-in control panels, and industrial air curtains are remotely controlled, since it will be difficult to reach their buttons.

Some models are additionally equipped with a thermostat, which allows turning off the heating elements or completely this equipment when the temperature set in the room is reached.

In industrial models, limit switches are often used, which allows the thermal protection to be turned on only when the door is opened. This saves energy. For ordinary doors, this saving method is not applied, since it takes 5-10 seconds to reach the operating parameters, and during this time the doors will already be closed.

To protect against overheating, almost all models have several degrees of protection: without turning on the fan, the heating element is not connected, when the temperature of the heating element reaches 80-110 ° C, the power is turned off.

Vertical protection, unlike horizontal protection, is installed on the side in the doorway. It is no different from horizontal, and its height should be at least 3/4 of the opening height.

The principle of operation of the thermal curtain

This device is also called a heat separator for its work. The heat inside the building is stored by means of a vertical air flow. In this case, air acts as a heat insulator and performs this quite effectively, given its low ability to transfer heat.

The thermal insulation properties of air are widely used - most heaters are either foam materials, inside the bubbles of which there is air or an inert gas, or a fibrous material that holds air with a pile. Clothes that block the flow of air with the fibers of the fabric or wool in the fur work in a similar way.

In a thermal curtain, air prevents heat loss by protecting it from horizontal air currents. The room is separated from the outer space by a wall of heated air. The vertical movement of the air is provided by a powerful fan. The heat curtain is placed above the door, and the heated air from it enters the floor and further spreads inside the room.

Due to the temperature difference, cold air cannot enter the room, which protects the internal atmosphere from such unfavorable influences:

Insects;
Dust and other air pollutants;
Traffic fumes;
Smoke;
Unpleasant odors.

To effectively protect the room from external influences, it is necessary to heat the air. The effectiveness of this protection will be significantly reduced if the air in the heat curtain is at or colder than the room temperature. Also, additional circulation of cold air will only lead to discomfort. Therefore, the device producing the heat curtain is provided with a heating element.

Heat curtains are divided into electric and water curtains according to the method of air heating.

Selection of heating power of the thermal curtain

This equipment is not a heater, and therefore, if we talk about heating power, the calculation is rather subjective, since it is an energy-saving device, which prevents warm air from entering the room in summer and cold air in winter. The technical characteristics of the air-thermal curtain indicate the temperature difference between the blown out and sucked in flow. In each model, the optimal selection of the heater power has already been made. Some manufacturers produce the same models of air curtains with heaters of different power, and therefore you can always make the right selection of the required power.

Important characteristics of all types of curtains

All of these types of curtains are classified according to characteristics such as:

Power.

The calculation of power indicators when choosing thermal curtains is calculated according to the following algorithm: with a ceiling height ranging from 280 to 300 cm, 1 kW of power should fall on 10m2 of the room. This is a simplified technique, but for a more accurate calculation of air conditioning equipment, you need to use the help of qualified specialists from companies that sell / install air curtains.

Household curtains can be installed not only on the openings of residential buildings. They are used for installation above checkout windows in kiosks and other MAFs. Such equipment reduces the likelihood of drafts and performs the functions of additional heating equipment for small rooms.
Medium curtains are designed for openings with a height of 250 to 300 cm. They provide a reduction in heat loss with frequent opening of the entrance doors and prevent drafts in large rooms.
Large and heavy-duty devices are designed for industrial facilities with an opening height of more than 700 cm. They are installed on the openings of warehouse gates or hangars, at the entrance groups of supermarkets and shopping centers.

Mode of operation.

permanent equipment;
systems of variable action.

Horizontal air curtains are installed above the openings of windows or doors. In this case, the climatic equipment is mounted over the entire width of the opening, in order to prevent the flow of outside air along the edges. This type of air curtain is the most popular, but in cases of the year there is no structural possibility of such installation, or for large openings, vertical devices with side placement are used. The installation technology of these types of curtains has minor differences.
Vertical devices are installed on the sides of the openings so as to ensure the horizontal direction of the produced air flow. To improve the efficiency of the climatic equipment, vertical air curtains are installed on both sides of the opening. In the catalogs of manufacturers, there are universal curtains that can be mounted in a vertical and horizontal position.

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