What Is An Air curtain?

Air curtains in most halls and buildings such as restaurants, arcades, and malls are usually located above the entrance and exit doors, which are in public use and many people visit these places daily. Due to the frequent opening and closing of the entrance door of these places during the day, their environment is constantly exposed to dust, cold and heat, insects, etc., as well as energy consumption spent on cooling Or the heating of these environments increases. In order to prevent these problems, a device called an air curtain is usually installed above the entrance door of these places. In the rest of this article, the types, advantages, and applications of the air curtain device have been discussed.

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The performance of the air curtain device

 when the entrance door is opened, air curtain is starts working automatically and separates the inner space from the outer space with air pressure. This system consists of a body, a motor, and a strong fan, which continuously blows compressed air from the top of the door directly down after the entrance door is opened. The airflow layer moves at a speed and angle that prevents the penetration of any airflow. In general, the effect of the air curtain in creating a barrier between the entrance varies from 60 to 80%. Due to its unique advantages, the air curtain is one of the most widely used systems in crowded places.

Types of air curtain devices

According to the type and direction of installation, air curtains are divided into three general categories: vertical type from top to bottom, vertical type from bottom to top, and horizontal type. The horizontal type of air curtain is used in special cases and industries due to being installed on both sides or one side of the entrance door, and as a result, the price of the air curtain in this case is very different from the other two models. It should also be noted that the vertical type from top to bottom is the most widely used type of air curtain due to the possibility of easier installation and better thermodynamic efficiency.

Commercial office air curtain

This series of air curtain, as its name suggests, is suitable for use in office and commercial places. This model is installed and operated in restaurants, commercial centers and arcades, stores, therefore, due to its indoor location, the appearance of the device is of particular importance. For this reason, the office-commercial model with a more luxurious appearance is produced and supplied in various colors. Also, they are designed in smaller dimensions and weight that occupy less useful space of the structure and do not cause any disturbance to entry and exit. Another feature of the office-commercial model is the ability to install coils and thermal heaters to create warm air in the cold season.

Industrial air curtain

Industrial air curtains are usually used in industrial buildings and factories whose entrance doors are higher and wider. Industrial air curtains are specially designed and manufactured by manufacturing companies according to specific factors such as the length of the horizontal axis of the air curtain, the strength of the wind pressure, the temperature difference between the two environments, the height of the door and according to the installation conditions and location. Due to the use of fans with high aerating power, the energy consumption in them will be higher than in office-commercial models.
The remarkable thing about industrial air curtains is that they are generally provided in the built-in form. It should be noted that the air curtain can be provided in the following types:

• Cooling air curtain
• Cooling and heating air curtains

Application of the air curtain device

The purpose of using an air curtain in public places is to prevent energy wastage in the first stage, and we will have clean and pollution-free air in the environment. Among the series of applications of this device, the following can be mentioned:

• Food factory and producer of dairy, protein, pharmaceutical products
• Chain stores, grocery stores, shopping centers
• Cold storage and material storage places, greenhouses
• Restaurants, large kitchens, caterers
• Office buildings, banks, museums
• The lobby of hotels, arcades, airports
• hospitals

Advantages of the air curtain device

As mentioned, this series of air conditioning systems have many advantages, the owners and builders of mass projects have tried to use this series of equipment as much as possible. In the following, we will mention some advantages of using the air curtain device and its use in public places.

• Optimizing energy consumption: one of the main features of these systems is preventing energy wastage. The function of the air curtain is to separate two environments with temperature differences, so that by repeatedly opening and closing the entrance door in a public place, some air is moved between the two environments and energy exchange takes place. In this case, we will see a waste of energy. The air curtain prevents this energy exchange by creating a layer of several centimeters, and in this way, it will have a significant effect on preventing energy wastage.
• Preventing the entry of insects: by opening and closing the door, small and annoying insects enter the interior space and besides creating a nuisance, it also endangers the health of the environment. Creating hygienic and clean air is one of the priorities of public places such as restaurants and kitchens. The air curtain device can prevent insects from entering the interior space and this provides the health and comfort of the residents.
• Preventing the entry of dust: The outer space is full of fine dust, smoke, dust and combustion gases of cars, which easily enter the interior space when the door is opened, and it is considered unpleasant. By installing the air curtain, this problem has been solved and we will not have any types of air pollution in the indoor space to a significant extent.
• Protecting indoor air quality: The owners of public places have tried to create a uniform air and temperature in the indoor space by following the principles. For this reason, maintaining the created air is one of the important points. By installing an air curtain, creating an air flow prevents the indoor air from escaping to the outside.
• Constant air circulation and flow: warm air goes to the top and close to the ceiling because it is lighter, and cold air accumulates at a lower height. By installing this device, the air is constantly circulating and it is prevented from stagnating. Therefore, we will have a uniform and comfortable air in the space and many heating production costs will be saved.

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Important points when installing an air curtain

Important points when installing an air curtain are:

• The place of installation must have sufficient strength so that after installation, the device does not shake.
• The device should be installed exactly in the upper part of the door and avoid unnecessary installation in higher parts.
• Disturbing obstacles must be collected above the door.
• If you choose a device without a heating system at the entrance of public places, it is better to place the suction of the device near the hot air (heater or fan coil) in winter.
• Normally, air curtains are installed inside and above the entrance door. If it is in the upper part of the wall door, the device is easily installed. If there is a window or an inscription on the upper part of the door, it will be necessary to use metal sections (can or corner or belt) and a strong metal coil to install the air curtain.

Installation of air curtains in cold stores

Installation of air curtains in cold stores is as follows:

• It is recommended to install an air curtain inside in cold storage with temperatures above zero degrees Celsius.
• It is recommended to install an air curtain outside in cold stores with a temperature lower than zero degrees Celsius (due to the possibility of the device's propeller freezing).
• The return wind that hits the floor itself causes heat loss, it is not recommended to install high-speed devices in cold stores.
• An air curtain with an automatic system is recommended when opening and closing the cold storage door.
• The main justification for the cold air curtain in addition to maintaining the quality of the stored goods is; It saves energy consumption and prevents refrigeration waste. From this point of view, the cost of installing an air curtain can be returned in the short term. Installing an air curtain at the door of greenhouses (dairy factories, etc.) is also recommended.

Air curtain usage tips

The important points of using an air curtain are:

The performance of the air curtain depends on the difference in air pressure outside and inside the environment, and the lower the pressure, the higher the efficiency of the air curtain.
A heating coil can be used in the air curtains for the heating system.
The efficiency of the top of the air curtain is vertically downward and depends on the type of centrifugal fan installed on it because the fan used in the air curtain is responsible for returning the air.

Final speech

The specialized collection (Damatajhiz) (the first and most reliable authority in the country in the field of building facilities equipment and all air conditioning devices), offers you all kinds of sand filters and hundreds of other products, guaranteeing the originality of the product, valid warranty, and reasonable price. In addition, if you have any questions about choosing and comparing the brands of this product, you can get free advice from the heating equipment experts.

In Iran, the first and most famous specialized group in the field of building installation equipment, air conditioners, and all equipment for swimming pools, saunas, and jacuzzis since 2004, DamaTajhiz is a specialized group. Refer to the time of this group. For more information, you can get advice from the experts of DamaTajhiz Engineering and Production Company by calling 021-88822550.

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