Air duct cleaning from Alan's blog

The fact that any room must be ventilated was known even in ancient times. In any case, the builders of the Egyptian pyramids provided for special ventilation ducts, thanks to which the mummies of the great pharaohs have still retained their "presentation". It is no coincidence that Lenin's mausoleum was created in the image and likeness of the tombs of Giza:

However, fresh air is useful not only for those who are still "more alive than all living things". If you inhale anything, you can retire to another world much earlier than the deadline. The air "cocktail" of most large cities contains an excess of sulfur dioxide, carbon monoxide, various compounds of lead and heavy metals, and just ordinary dust. The danger is fraught with many building materials from which the structures of the house itself are made - they can become a source of radon and asbestos. In addition, washing powders, detergents and other household chemicals are also imperfect from an environmental point of view, as they are a supplier of ammonia, hydrogen sulfide and other toxic substances.

That is why ventilation systems are provided in the overwhelming majority of residential and office buildings. However, over time, dust, debris and fumes will settle on the surface of the air ducts, creating a breeding ground for bacteria and making it difficult for the ventilation system to work. Therefore, it is worth regularly contacting theairduct cleaning service

If the air movement occurs due to natural draft, then the result will be a gradual reduction in inflow and exhaust, up to a complete blockage of the ventilation duct. For the time being, it only saves that some air ducts made in the construction version have a decent cross-section.

The situation is worse in artificially induced systems, in other words, equipped with a fan. The air performance of such systems is much higher, and therefore the clogging of the system is much faster. In addition, various components and assemblies, such as fans, heat exchangers, humidifiers, valves, and grilles, become "points of crystallization" of dust.

Here, the problem of overgrowing the air duct with all kinds of rubbish has another very unpleasant side. As a result of a sharp increase in the resistance of the system, the fan does not deliver the design capacity. In addition, when dust and grease builds up on the working parts, it starts to work with overload, heats up and eventually fails. In practice, there have been cases when the customer had time to change the equipment several times, blaming the quality of the equipment, electrics and improper operation, until, finally, the true reason was found out.

In addition, dust trapped in the duct is a terrible danger during a fire. It ignites like cotton wool, and thanks to the air flow, the fire instantly spreads throughout the building. So a cigarette butt thrown into the ventilation system by a worker who was repairing a roof led to the burnout of several floors in one of the ministries.

Even more dangerous are fatty deposits, which are inevitable in the ventilation of cafes, restaurants, meat processing plants and other food industry enterprises. The jelly-like mass that has settled on the walls of the air ducts not only impedes the movement of air and burns perfectly, but, on top of that, serves as a breeding ground for all sorts of bacteria, fungi, dust mites and other microorganisms. Carried away by the air flow, they can travel throughout the building. Therefore, in a number of countries, the condition of ventilation systems at catering establishments and in the food industry is checked not only by firefighters, but also by SES.

And if buildings are equipped with central air conditioning systems with partial air recirculation, the problem can be even worse. Any infection transmitted by airborne droplets, once in one of the rooms, will certainly be spread throughout the house.

Another problem that we faced first abroad, and then in our country, is the clogging of air ducts during the construction process. Since in modern office complexes and luxury housing engineering communications (including ventilation) are laid and launched before finishing work, various aerosols, suspensions, asbestos and ordinary dust are carried into the air ducts. As a result, rooms in which the finishing has already been completed may suffer from paint or whitewash applied to others. And in the future, the "good" settled in the duct can become a source of unpleasant odors.

Until recently, the problem of cleaning air ducts in most cases was solved by replacing them, which often required major repairs. But nowadays there are technologies that make it possible to rid the "lungs of houses" from the accumulated debris without even disturbing the people in the building.

Perhaps the most modern and comprehensive air duct cleaning technology was developed by the Danish company "DunDuctClean". It includes a whole range of activities for the implementation of which compact unified equipment is used.

First, it is necessary to determine the degree and nature of the contamination. To do this, a special multi-purpose robot is launched into the ventilation duct, capable of penetrating air ducts with a height of over 150 mm. The scout carries a spotlight and a miniature video camera, which allows you to visually see the opening landscape on a color TV screen.

Rags of dust, slimy fat deposits in which the robot leaves a distinct track, construction waste. Sometimes rats or cockroaches, which willingly settle in such places, "animate" the frame. The sight is so repulsive that 90% of customers who wished to examine the air ducts, as a result, order their cleaning.

Air ducts are divided into sections. This can be done by closing the control valves or by attaching special barrier cylinders inside the network. Inflating like a balloon, they tightly block the channel.

On one side of the selected area, a special filtering unit is installed, which creates a negative pressure in the air duct, on the other, the cleaning machine is started. For the smallest air ducts, a special rotating "brush" is used, which is connected to an electric drill using a flexible shaft. And the cleaning of air ducts over 150 mm in height is carried out by the same multifunctional robot. Depending on the shape and size of the air channels, it is equipped with an appropriate set of rotating brushes. Thus, it is possible to free round air ducts with a diameter of up to 1200 mm and rectangular air ducts up to 1100 mm in height from dust, controlling the quality of work using a miniature video camera. A separate conversation - vertical sections, for which there is a special robot.

To remove fat, you have to use a more sophisticated technology - "IceTech". Here, dry ice pellets are used to "fire" the surface of the duct. All the necessary equipment, including a video camera that allows you to visually control the quality of cleaning, is again installed on a universal robot.

This method of cleaning is much more efficient and safer than the previously used methods of dissolving fat using chemical reagents, followed by removing the resulting slurry using water and compressed air. Since absolutely sealed air ducts do not exist in nature, the treatment of channels with reagents always leads to leaks and expensive repairs. At the same time, cleaning the canals with dry ice does not pose such a danger and does not lead to contamination of the premises.

Additionally, it is necessary to say a few words about filtering units that provide a static pressure of 750 to 1300 Pa, with a capacity of 500 to 10,000 m3 / h. Dust and grease, carried away by the powerful air flow, enter the centrifuge. As a result, all the dirt ends up in a special bag, and the air flow is directed to the HEPA filter. Such a purification system is actively used in medical institutions and, depending on the filter class, captures 99.97-99.995% of all impurities. Thus, modern "chimney sweeps" do not leave behind any dirt.

Another area of ​​application of Dan-Duct Clean technologies is the disinfection of air ducts, where the same multifunctional robot with a special set of equipment is used for taking samples and subsequent disinfection of air channels.

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By Alan
Added Mar 31


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