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Thermal curtain on the entrance door: installation and operation

Thermal curtain on the front door: the key to creating a comfortable microclimate

To create a favorable microclimate in the room, it is necessary to maintain a comfortable temperature and avoid walking drafts. This is especially true for crowded places where doors open very often. To keep the internal heat, get rid of drafts and eliminate the possibility of getting cold polluted air inside the room, a thermal curtain on the front door will help.

With the help of a thermal curtain over the door, you can reduce heat loss in the cold season

What is a heat curtain and why is it necessary

During the winter period of the year, dense cold air that creeps across the floor is rapidly sent into the room through the front door and squeezes out warm light air. If a wind component is added to such a normal air exchange, then strong drafts will walk around in the room. In this case, when the door often opens or is constantly kept open, no heating device can cope with the heating of the room. Here it is necessary to create a powerful flow of warm dense air, the pressure of which would prevent the pressure of cold air masses that come from the street.

The thermal curtain protects the room from the penetration of dust, smoke and unpleasant odors along with the street air

The heat curtain perfectly copes with the task. It is a kind of cold air separator on the entrance doors. The principle of its operation is similar to the operation of a heat fan. It is able to reliably protect the room from the penetration of drafts and cold from the street, and its inhabitants from diseases.

If all the parameters of the heat flow are correctly calculated, it will not only prevent the penetration of cold masses and prevent them from escaping heated, but also helps the heating system, due to the fact that most of it returns to the room.

The air curtain can be used not only in winter. Her work is also justified in the summer season. The directed air mass prevents cool indoor air from going outside, and street air heated by the summer heat from entering the room.

Thermal curtains are used in rooms with high traffic

Regardless of the season, the veil performs another important function. It protects the indoor microclimate of the room from the penetration of various suspensions harmful to human health along with the street air. The curtain is able to hold rain, snow, dust and hordes of small insects.

Useful advice! The air curtain allows you to zone the premises, creating a different microclimate.

Properly selected equipment can save about 30% of the electricity that is spent on heating and air conditioning of the room. In addition, the device itself does not take up much useful space and does not clutter up the interior of the room.

The principle of operation of the thermal curtain over the door

Thermal curtain on the entrance door: design and principle of operation

In appearance, the heat curtain resembles an indoor air conditioner unit with a pronounced elongated body. Air intake from the room is carried out through a grate located in its upper part. There is a nozzle at the bottom of the housing, through which the air flow exits under pressure. The control buttons can be located on the housing itself or be mounted in a remote unit, which should be located near the device. Some models of curtains have an infrared remote control.

Inside the housing there is a heat exchanger, thanks to which the air is heated, and a turbine-type discharge fan, which supplies it under pressure to the outside. A heating element, a spiral or a water heating circuit, which is typical for stationary models, can act as a heat exchanger.

Many thermal curtains have a built-in filter designed to clean the air mass from contamination. Almost all models, regardless of the manufacturer, have built-in protection against overheating, body breakdowns and short circuits. They can also be equipped with thermostatic control of the fan speed and the heat exchanger heating level.

The scheme of the thermal curtain design: 1 — casing,2 — fan housing, 3 — impeller (steel), 4 — output grille, 5 — electric motor, 6 — starting unit 7 — return button of the electric thermal current relay

Varieties of air-heat curtains

There are many varieties of thermal curtains, reviews of which can be found on specialized websites. They all differ in the method of installation and the principle of operation.

Depending on the installation option, the curtains can be:

  • horizontal;
  • vertical;
  • universal.

The horizontal device is installed directly above the doorway, window or gate, and is attached using brackets or threaded rods. The vertical heat curtain is mounted on one or both sides of the doors. The height of the device should occupy three quarters of the height of the doorway. Horizontal models are more bulky and are not suitable for small spaces. Universal curtains can be mounted both vertically and horizontally. It is this mobile design that is the most in demand, since it is a full-fledged additional element of heating. It is often used for office spaces and apartments.

Important! Horizontal devices are not designed to be installed vertically.

Heat curtains can be positioned vertically or horizontally

According to the type of installation, there are suspended and embedded models. The first option is attached directly to the wall. The second one is built into the wall or ceiling according to the height of the opening. Such models consist of a module and a decorative grid.

Useful advice! The heat curtain built into the suspended ceiling will look very aesthetically pleasing.

Air Curtain Heat Exchanger Options

Depending on the availability and type of heat exchanger , curtains are distinguished:

  • water;
  • electric;
  • without a heat exchanger.

Heat curtains with a water heat exchanger require minimal operating costs

The most popular and in demand are air electric heat curtains that operate from a 220 V network. These devices have high performance indicators and are easy to install. Many models are equipped with the ability to smoothly adjust the temperature of the air flow heating. The main disadvantage of electric curtains is the significant energy consumption associated with ensuring the operation of the fan and heating the heat exchanger. In addition, the devices have a certain inertia at startup, i.e. it takes a certain time for the curtain to enter the operating mode.

For water heat curtains on the entrance door, which have the serial designation RW, hot water acts as a heat carrier. The devices are connected to a heating system or centralized hot water supply through pipes that are located in the curtain body. The main advantage of this type of device is the minimum operating costs. Here, electricity is spent only on the operation of the fan and the control system. However, the device is characterized by a lot of difficulties in the installation process. Here it is necessary to additionally mount pipes with shut-off valves and control valves.

When installing a water heat curtain, a branch from the general circuit should be provided in advance, which is not always possible with an already installed heating system. Also, a filter device must be installed for the tubular heat exchanger to prevent its overgrowth. When choosing a curtain, it is necessary to take into account the power of the installation, which should correspond to the capabilities of the heating system, so that the operation of the device does not affect the heating level of radiators.

Powerful industrial thermal curtains are used for doorways of commercial, office, industrial, warehouse, public premises

Air curtains without the RV series heat exchanger are not used to heat the air. They are used to protect the room from the ingress of street dust, insects and various contaminants. They also prevent air-conditioned air from leaking out. They are often used for zoning premises in production workshops, to prevent warm air from entering storages or freezers.

Electric heat curtains over the door

A heating element, a spiral or a ceramic heat exchanger can be used here as a heat exchanger. Devices with a spiral are the cheapest and at the same time low-power. You can buy a thermal curtain over the door for 4000 rubles. Due to the fact that the heat exchanger is open, it heats the air flow very quickly, entering the operating mode. However, such a heating element burns oxygen. Spiral curtains are characterized by a minimum service life.

Useful advice! Devices with a spiral should be used for rooms with a high air exchange rate.

Thermal curtains create a flow of hot air, forming an invisible thermal barrier for cold

Curtains with a heating element are more effective. It is a metal tube in the middle of which there is a heating element, wire or graphite, and sand. These devices do not burn oxygen indoors, work for a long time and smoothly. They are allocated at an affordable cost. The average cost of a heat curtain is 20 thousand rubles.

The most modern are thermal curtains with a ceramic heat exchanger, which quickly warms the air to a set temperature and switches to an economical mode of energy consumption. This device not only performs the task, cutting off the outside cold air, it allows you to significantly save energy. The disadvantage is the high cost of a heat curtain in comparison with analogues.

Classification of veils by purpose

Electric heat curtains have serial designations RM, RT and RS, which indicate the purpose of the device. Low-power mini curtains of the RS series are used for small openings of 1500×80 cm. Their capacity is no more than 500 m3/hour. Curtains are usually installed in transport ticket offices, street kiosks or above customer service windows.

For large warehouses, powerful water heat curtains are used

The most popular are the medium-power curtains of the RM series, which are used for standard openings with a height of 2.5-3 m. They are capable of pumping up to 2000 m3 of air per hour. Models usually have convenient remote units and remote control panels. Such middle-class devices are often used for the front door or for the transition from a cool hallway to a living room.

Related article:

Infrared heaters: pros and cons, prices for appliances

The use of IR heaters for various rooms. The heating area of the devices. Almak heaters.

High-performance devices over 2500 m3/h of the RT series are designed for openings with a height of 3.5-7 m. Install such thermal curtains on the gates to the workshop, auto repair shop, warehouse or production room, at the entrance to a supermarket or entertainment center.

Useful advice! For a wide doorway, several medium-power thermal curtains can be installed, which are arranged in a row.

The most effective devices are air-heat curtains with a heating element

How to choose a heat curtain

To choose the right heat curtain, it is not enough to determine the place of its installation and the principle of operation of the heat exchanger. You should pay close attention to the characteristics of the device:

  • curtain dimensions;
  • the performance of the device, which indicates the amount of air pumped per unit of time;
  • air flow velocity;
  • type of heat exchanger;
  • power of the heat exchanger unit;
  • device protection level;
  • type of control;
  • availability of additional options;
  • the appearance of the device.

Before you purchase a thermal curtain for the door, you need to familiarize yourself with the possible options, study the technical characteristics of the models, consider photos, decide on pricing policy and read consumer reviews on specialized websites.

Air-heat curtains can have both manual and remote control

Linear device parameters

The main parameter of the device is its length, which should completely overlap the doorway in order to create the necessary air duct along its entire width. There should be no gaps that contribute to the free penetration of cold and dusty air masses. The length of the devices is in the range of 600-2000 mm. For a standard-sized doorway, a curtain with a length of 800 mm is purchased.

Useful advice! For the best effect, you should purchase a curtain that creates an air flow with a width slightly exceeding the lumen of the doors.

If the width of the opening exceeds the length of the selected curtain model, it is better to install two units close to each other. When choosing a long model, an important nuance should be taken into account. The length of the curtain turbine usually does not exceed 800 mm, which is associated with an increase in vibration phenomena with its increase, and in order to minimize them, additional costs are needed, which will increase the cost of production.

When choosing a curtain, pay attention to the length of the device, which should completely cover the doorway

In this regard, manufacturers are going to some trick. In the center of the device there is an electric drive, to the right and left of which turbines of the required length are installed. However, there is a significant drawback in such a design. A low-pressure area is created in the central part of the device, through which cold air from the outside can freely penetrate.

Another important parameter is the length of the airflow jet, which should reach the floor at the rated power of the curtain. Here we are not talking about the height of the doorway, but about the installation distance to the floor. If the air flow does not touch the floor, there will be a gap that will allow the free movement of drafts.

Curtain performance and thermal power

The effective operation of the device depends on the density of the air flow. The internal pressure in it must exceed the external pressure at any point of the opening. The flow rate should also be optimal and not create discomfort for people. Its minimum value for the effective operation of the device should be at least 2.5 m/s. It depends on the diameter of the fan and the speed of its rotation.

The heat curtain has a protection system that protects the device from overheating

The technical data sheet of each device indicates its performance. A properly selected model should ensure the supply of air, which is only 1/3 of the dissipated downward, and the rest of its volume returns to the room. If the device is selected with excessive performance, then a significant part of the air will be carried out of the room to the outside, which indicates the inappropriate use of the curtain and unjustified costs of the spent electricity. If the curtain provides insufficient air flow, cold air masses will quietly penetrate into the room, making the installation ineffective.

For a doorway of a standard size of 800×2000 mm, it is necessary to choose a curtain with a capacity of 700-900 m3/ hour. However, manufacturers produce models with more modest parameters. When choosing a curtain, you should take into account the location of the entrance, temperature differences, wind direction and speed. All these characteristics are taken into account when calculating the heat curtain. Therefore, for each specific model, manufacturers indicate in the passport all the necessary parameters and recommendations for the installation location of the device.

The thermal power of the curtain is not a determining indicator when choosing a curtain. After all, the main purpose of the installation is not to heat the room and maintain the optimal temperature in it. The curtain should only compensate for part of the heat loss through the door. The device only helps the heating system to function better, but it should not replace it in any way. However, in practice, it is justified to install a 2 kW warm curtain as an additional heating. Most models provide a temperature increase of up to 20 ° C. In some cases, this value reaches up to 30 ° C.

The performance of the heat curtain is indicated in the technical data sheet of the device

Protection system and device management

Two control levels are provided for each model of the heat curtain. With the help of the first, the specified performance of the device is created and maintained. The second one is responsible for the operation of the heat exchange unit. A specially designed protection system eliminates the inclusion of the heater during the idle turbine, which will protect the device from overheating.

In the most budget models, the heating level of the heating element is already set and the performance of the device is set, which cannot be changed. However, for self-regulation of the microclimate in the room, it is better to choose curtains with the possibility of manual control of the device. There are also complex options where step-by-step adjustment by a curtain is built in, where several turbine power levels and heat exchanger heating gradations are provided.

Models with electronic control are very popular today, which allow for smooth and precise adjustment of the device. Usually the control unit is located on the device body. You can also buy a thermal curtain with a remote control or a remote unit that is located on the wall. A number of buttons are placed on the panel, with the help of which the effective operation of the curtain is configured: on/off, performance, heating mode, temperature, etc.

Modern models are equipped with electronic control, which allows for smooth and precise adjustment of the device

Each modern model is equipped with an increased degree of protection against overheating, voltage drops, short circuit, phase breakdown on the housing and other protection options. There are also models that are equipped with a thermostat and timer. Newer versions provide for the regulation of the air supply angle, which increases the efficiency of the curtain.

Installation of a heat curtain

Despite the fact that the degree of complexity of installing the device is much easier than for a household air conditioner, manufacturers insist on entrusting the installation of the curtain to a professional. However, you can do the work yourself.

Before proceeding with the installation of the heat curtain, it is necessary to provide a power supply line of the required power, the connection point of the device, protective and safety elements (RCD and automatic). Next, you should perform an accurate marking, after which the mounting parts are fixed on the wall plane for further hanging of the heat curtain over the door. The set of devices usually includes a mounting panel or brackets and fasteners.

It is better to entrust the connection of a heat curtain with a water coolant to a specialist

If the selected curtain model has adjustable blinds, they must be tilted from the vertical at an angle of 30 degrees. towards the entrance. The design of the air nozzle of many models already has such a slope of the airflow. It may also be necessary to install a signal cable and attach the remote control panel to the wall. All these steps are described in detail in the installation instructions of the device, which should be read before installing the curtain.

Installation of a horizontal or vertical water heat curtain is a more complex event that requires certain thermal calculations and installation of additional pumping or collector equipment. To perform the installation, it is necessary to involve specialists in this matter.

Repair of heat curtains

Only a qualified specialist can assess the scale of the curtain breakage and the possibility of its repair. He will easily change to a new, out-of-order part, and perform the subsequent configuration of the device.

The double-row water heater has high performance, which allows the device to be used for large rooms

The most common cause of curtain breakage is overheating of the device, which occurs due to non-compliance with the recommendations of the instructions. The curtain turns on at full power, as a result, the fan, heating element, relay breakage occurs, the switch fails and electrical contacts suffer. Most often, curtains with a device length of more than 80 cm fail, which are equipped with a very complex configuration.

A service center specialist can fix a minor malfunction on the spot. However, if more complex repairs are required, the equipment is dismantled for a while. You can also try to fix the problem yourself by studying the instructions in detail before doing so.

All work must be carried out in compliance with safety regulations. If the device does not turn on, first make sure that there is electricity. Then check the contacts and fuses. Faulty elements can be changed independently, following the instructions.

Important! All work with the device is performed when it is completely disconnected from the network.

Scheme of options for the location of heat curtains

If the switch of the device is in the “Heating” position, but the function is not performed, the switch may have failed, or there is a bad contact in the electrical circuit. In the first case, the element is changed to a new one. In the second option, you should check the correctness of the connection and restore the contact.

If the heat curtain is periodically switched on and off, it is necessary to check the correctness of its installation and clean the inner part of it from accumulated dust.

Important! The device will work properly when all the recommendations for its installation, maintenance and periodic cleaning are fulfilled.

Scheduled maintenance of heat curtains

In order to ensure the effective and long-term operation of the heat curtain, it is necessary to strictly follow the recommendations specified in the operating instructions of the device, which needs timely professional maintenance.

In order for the heat curtain to have a long operational life, it is necessary to periodically perform preventive diagnostics of the device

Monthly it is necessary to perform an external inspection of the device, check the fasteners, fences and the construction of the unit. The current and voltage are checked for each phase. It is necessary to test the operation of the heat curtain in all its modes and the control panel. The housing, the front panel of the control unit, the entrance blinds and air filters are cleaned.

Once a quarter, a qualified specialist tightens the threaded connections of the wires on the terminal boxes, cleans the contacts, checks the operation of fuses and tips. If faulty parts are detected, it changes them to new ones. Curtain diagnostics is also performed to identify and eliminate extraneous noise. The fan blades are being examined.

Every half-year, seasonal debugging of the operating modes of the device should be performed, which consists in the deconservation or preservation of the heat curtain. At this time, pneumatic cleaning of the heat exchanger and other components is also performed.

The heat exchanger should be cleaned annually using a special chemical composition. The degree of wear of the bearings of the fan motors is also set.

From time to time, it is necessary to perform pneumatic cleaning of the heat exchanger and other components

Well-known manufacturers of electric thermal curtains over the door. Device price

Today, the most popular manufacturers of thermal curtains are the following companies:

  • Friko;
  • Pyrox;
  • Olefini;
  • Termoscreens;
  • Ballu;
  • Teplomash;
  • Tropic.

More than 70% of the entire product range belongs to the Swedish company Friko and the Norwegian company Pyrox. The products of these brands are a benchmark for other manufacturers. The companies produce a wide range of high-quality products, which begins with compact models for window openings and ends with large-sized industrial thermal curtains. The reliability of the devices is ensured by the use of high-quality heating elements developed using special technology as a heat exchanger, which prolongs the service life of the entire installation.

Both small low-noise models and powerful devices for industrial premises are presented on the modern market

In industrial electric heat curtains with a length of more than 1500 mm, a single large-diameter turbine is installed, which guarantees a uniform and intensive air flow. Both companies produce devices with distinctive energy-saving characteristics and silent indicators. However, the products of European brands are very expensive. You can buy a 3 kW heat curtain of small dimensions for an average of 50 thousand rubles. Products for standard-sized doorways start from 100 thousand rubles. The price of the overall Friko thermal curtain reaches 800 thousand rubles.

Less expensive products are offered by the English brand Termoscreens. Despite the fact that the products have a lower power of 1.5 kW, thermal curtains are not inferior in reliability to Scandinavian manufacturers. The role of a heat exchanger in thermal curtains is performed by an electrospiral. The air flow is created by small diameter turbines. The average price of air-heat curtains of small sizes is 7-10 thousand rubles. Products for wide openings will cost an average of 25-45 thousand rubles. The price of the embedded type models reaches 100 thousand rubles.

Vertical electric heat curtains of semi-industrial type are offered by the Greek trademark Olefini. The products are characterized by high performance, but they work quite noisily. Therefore, they are often installed in production workshops. Curtains have a low cost, which averages 50-75 thousand rubles.

The size and installation option of the heat curtain must be selected based on the parameters of the room

Heat curtains of the Ballou

The Chinese manufacturer Ballu has several factories in Russia. This allows the company to produce budget products focused on the needs of the Russian consumer. The company is constantly engaged in improving products, expanding the product range and reducing the cost of products. Ballu thermal curtains are characterized by high energy-saving indicators, which allows you to save a resource without reducing the effective operation of the device.

The manufacturer produces several series of devices. The S1 series includes a budget electric thermal curtain Ballu BHC CE 3. The capacity of the device is 300 m3/hour. It is installed above the entrance to a shopping center, cafe or office at a height of no more than 2.5 m. The heating element can operate at full or half power and without heating in the summer. The cost of the device is 4,300 rubles.

Another budget model of the new generation is the Ballu BHC CE 3T thermal curtain. In comparison with the previous product, this device has a thermostat, and its capacity reaches 400 m3/hour. The price of the curtain is 6,000 rubles.

Electric Heat Curtain Ballu BHC-3.000 SB

The S2 series differs from the S1 in that the devices are equipped with a needle heating “stitch element”, a thermostat and a noise reduction system. The series begins with a small-sized BHC 3.000 SB thermal curtain with a capacity of 300 m3/hour. It can operate at full power of 3 kW and in economy mode at a power of 1.5 kW. The price of the device is 4,000 rubles.

A more advanced small-sized thermal curtain Ballu BHC L06 S03 with a capacity of 350 m3/ hour is equipped with an electronic wired remote control BRC-E with a wide functionality. The price of the product is 4,500 thousand rubles.

The Ballu BHC L08 S05 thermal curtain with a capacity of 450 m3/h is installed on a standard doorway. It operates at full power of 5 kW, and in economy mode of 2.5 kW. The cost of the device is 6,400 rubles. Another BHC 5,000 SB heat curtain with a capacity of 400 m3/h is also designed for doors with a width of 800 mm. Its cost is 5,990 rubles.

Ballu BHC-L06-S03 Thermal Curtain Model

The price of the bulky thermal curtain Ballu BHC L10 S06 with a capacity of 1050 m3/hour and a capacity of 6 kW is 10,000 rubles.

The T series includes modernized devices with a heating element as a heater. The curtains are equipped with a thermostat, have a low level of noise and vibration. The length of the air stream reaches 3 m. One of the most popular models of this series is the Ballu BHC L08 T 03 thermal curtain with a capacity of 600 m3/hour and a power of 3 kW. The price of the device is 5,700 rubles.

Heat curtains Tropic

One of the most popular domestic manufacturers of thermal curtains is the Tropic company. It produces a wide range of semi-industrial, household devices, curtains for doorways and gates of different sizes, which differ in size, performance, type of coolant, type of heating element and installation location. The company’s products are characterized by high reliability and low cost of production.

Household heat curtain from Tropic company, model A3

All thermal curtains of this brand are combined in a series. The smallest and cheapest are considered to be thermal curtains of the “K” series, which are used for doorways up to 2 m high. Their productivity is in the range of 150-350 m3/h Due to its mini-dimensions, the device can be used not only as a heat curtain, but also as a fan heater or a heater with a “warm floor” function. You can buy an electric heat curtain for 3200 rubles.

The “A” series includes lightweight, compact, low-noise and inexpensive devices that are positioned horizontally above a doorway up to 2.2 m high. The curtains are equipped with a “stitch element”, an ultra-light aluminum alloy impeller, which reduces the time the device goes into operation, reducing vibration and noise. The most popular and budget model from this series is the Tropic A 3 thermal curtain with a capacity of 270 m3/hour. The installation price is only 3,700 rubles.

The “M” series contains curtains of small size, which have an aesthetic appearance and advanced technical characteristics. They can be installed for doorways up to 2.3 m high vertically and horizontally. The role of the heat exchanger here is performed by the “stitch element”, which ensures reliable, silent and efficient operation of the device. The curtains have high performance, convenient adjustment and increased functionality. The kit includes a remote control with a built-in thermostat.

Electric Heat Curtain Tropic Line T105 E10 Techno

The smallest model of this series is the Tropic M 3 thermal curtain with a capacity of 450 m3/hour. The price of the device is 5,900 rubles. A Tropic M 6 thermal curtain with a capacity of 900 m3/hour is suitable for standard-sized doorways.

The “T” series includes medium-sized curtains with a capacity of 3-12 kW. They are installed above the entrance doors of shops, warehouses, cafes, a vestibule to a height of no more than 2.5 m. A finned heating element acts as a heat exchanger. The built-in thermostat controls the operation of the device. The price of a thermal curtain with a minimum capacity of 1100 m3/hour for this series is 10,600 rubles. The maximum capacity of the device of the “T” series is 4200 m3/hour. You can buy a silent thermal curtain over the door for 30,000 rubles.

Air and heat curtains Teploomash

No less popular manufacturer of thermal curtains is the Russian company “Teplomash”. It produces a wide range of high-quality equipment with an electric or water heat source, which is clearly presented in the catalog. The price of thermal curtains of the heat pump depends on the size, performance, installation location of the device and the heat source. All models are combined in a series with a numerical designation. The higher this number, the more powerful the product. Recommendations for the installation and operation of the device are described in detail in the instructions. “Heat curtain Teplomash” individually for each model.

Thermal curtains Teploomash are powerful devices and have high performance

Low-power and medium-power KEV thermal curtains are assembled in the 100, 200 and 300 series. The capacity of the devices is in the range of 300-2800 m3/hour. They are installed in retail premises and office vestibules. The price of a small-sized 2 kW heat curtain with a capacity of 300 m3 / hour is 2,500 rubles. The maximum performance device will cost 35,000 rubles. For comparison, the price of a water heat curtain of a heat pump with a capacity of 2800 m3 /hour will be at least 41,000 rubles.

Industrial devices are more powerful and have high performance. These include models from the 400 to 1000 series. They are installed in workshops and warehouses. The price of a thermal curtain for an entrance door up to 4.5 m high will average 30 thousand rubles. The cost of a powerful model with maximum performance will be at least 110 thousand rubles.

For rooms with increased design requirements, thermal curtains from the 600 series should be chosen. The devices are installed in office, administrative premises, cafes, restaurants, hotels with a pretentious interior design. You can buy a heat curtain from this series for an average of 55,000 rubles.

Thermal curtains from the company Teplomash have a simple design, are easy to install and are easy to operate

Only a properly selected and installed heat curtain according to all the rules will be able to work effectively and fulfill its purpose. And scheduled maintenance will help extend the life of the device.

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