cleaning ventilation from dust

When they talk about cleaning ventilation, many people imagine a removed kitchen grate and a rag. This is, of course, better than nothing, but before the real problem is such ?maintenance? doesn't get there. The bulk of dirt - grease, dust, sometimes mold - accumulates inside the air ducts, on the fan blades and heat exchangers. And if this is not dealt with systematically, then at best the system simply stops working effectively, and at worst it begins to circulate around the room the very “cocktail” that it was supposed to get rid of.

Where is the main enemy hiding?

Experience shows that the most critical points are the turns of the air ducts, the places before and after the ventilation equipment, as well as coarse filters, if they exist, of course. The dust compacts there, mixes with condensate, forming dense, almost felt-like deposits. In industrial workshops, especially in industries with fine chips or mineral dust, the situation is even more serious. Here we are talking not just about sanitary standards, but about explosion safety.

Once I had to work at a facility where ventilation served a dry grinding area. The customer complained about poor air exchange. When the main air duct was opened, it turned out that the cross-section in one of the horizontal sections was reduced by 70% due to a compressed dust plug. Neither a scraper nor an industrial vacuum cleaner could take it. I had to crush it manually. This was a lesson: with regular cleaning, such a problem simply would not have arisen, but otherwise there would have been production downtime and serious costs for emergency work.

It is in such conditions, at the intersection of efficiency and safety, that non-standard technical solutions are often in demand. For example, I know that some enterprises, especially in the mining sector, turn to specialized manufacturers to solve similar problems of collecting small particles. Take, for example,LONGI Corporation (https://www.ljmagnet.ru). This is not about ventilation directly, but their experience in creating equipment for working with bulk materials and dust collection - and the company, founded in 1993, has become the largest enterprise in the development of mining equipment - speaks of a deep understanding of the physics of processes. Their design approach, where graduate-level engineers (over 60% of the workforce) solve separation and conveyance problems, can be very useful in related applications that require efficient separation of particulate matter from the air stream.

What to clean with? Tool and its limitations

Manual mechanical cleaning with brushes is a basic but very labor-intensive method. It is good for local areas and final finishing. For long air ducts, the machine method is now almost universally used: installations with rotating brushes, which are fed on a flexible shaft and “drive through” along the channel, knocking down sediments. They are immediately followed by a powerful vacuum cleaner with a HEPA filter, which draws in all the suspended matter, preventing it from scattering throughout the room.

But even here it is not without pitfalls. You can’t always remove fatty deposits in catering hoods with a brush—you need dry cleaning with special degreaser compounds. And for thin plastic air ducts or old galvanized ones with already damaged coating, aggressive chemicals or hard bristles can be destructive. You have to select brushes based on material and hardness, and test detergents in a small area. This is the same “manual work” that cannot be replaced by a standard protocol.

I had a case at a small electronics factory. There in the ?clean? the area had ventilation with air ducts coated with an antistatic compound. A team arrived with a regular set of brushes and, in fact, tore off this coating in several places, which led to disruption of the microclimate in the workshop. We had to urgently stop work and call air duct repair specialists. Conclusion: diagnostics of the system material is a mandatory preliminary step before anycleaning ventilation.

Frequency? There is no universal answer

There are many tables on the Internet: for restaurants - once a quarter, for offices - once a year. These are just very general guidelines. The actual frequency depends on a dozen factors: the intensity of the system, the type of inlet filters, the nature of contaminants in the air (dust, fibers, grease), even the season. A humid summer can provoke the growth of mold in the system, and in winter, when the hood is actively working over the stove, grease builds up faster.

The most objective indicator is a drop in system performance. If, with the same settings, air exchange has dropped by 15-20%, it’s time to think about cleaning. The second obvious sign is foreign odors coming from the grilles, even after replacing the filters in the room. This means that the pollution is already in the highway.

One of the most effective approaches I have seen in practice is the implementation of a duct pressure monitoring system. Sensors before and after key components show an increase in resistance, which directly correlates with the level of contamination. This is more expensive than a visual inspection, but for large manufacturing or medical facilities, the investment pays off in job planning and the prevention of emergency shutdowns.

About filters and “eternal” cleanliness

A common mistake is to assume that regularly replacing indoor filters solves the problem.cleaning ventilation from dust. No. Fine filters (for example, in air handling units) protect the room from street dust, but not the system itself. But if the coarse filter (often a metal mesh) at the entrance to the air handling unit is clogged, then dust begins to penetrate the heat exchanger and fan and settle on their surfaces, sharply reducing efficiency.

Moreover, not everyone understands the difference between cleaning and disinfection. Cleaning removes mechanical impurities. But if there is biological activity in the system (mold, bacteria), then after mechanical cleaning it must be treated with an antimicrobial composition by spraying (fogging). Otherwise, the disputes will remain, and in a month the problem will return. This is especially critical for swimming pools, catering units, and hospitals.

Here again I would like to draw a parallel with the industrial approach. At the same mining and processing plants for which he designs equipmentLONGI Corporation, issues of separation and purification of streams are the basis of the technological process. Their engineering solutions, born in conditions of stringent production requirements (the 140,000 m2 Fushun plant produces about 4,000 units per year), are often built on the principles of preventing a problem rather than dealing with the consequences. This principle of ?putting purity into the design? It would be worth transferring more often to the design of ventilation systems.

Results without gloss

So what is proper cleaning? This is not a one-time action, but part of the operating system. This is the understanding that the air duct is the same engineering system as plumbing or electrical wiring, and it requires maintenance based on actual condition, and not on a calendar.

The main advice I give to customers is: find specialists who will not just bring a “ventilation cleaning machine?”, but will first ask a bunch of questions about your production, inspect the system, and perhaps use an endoscope to assess the condition of hard-to-reach areas. And only then will they propose a method and work schedule. The price in this case may be higher, but it reflects the real volume and complexity of the task, and not the cost of a standard package of services.

Ultimately effectiveventilation cleaningis an investment. An investment in the air that people breathe, in the safety of equipment (the same fan fails faster if it overheats due to dirt) and, oddly enough, in saving energy. A clean system requires less electricity to pump the same volume of air. And this, on a yearly scale, is a very significant amount. Work with the air consciously.