TFM process

TFM is a patented process (US Patent 9291487 B2). It suits all devices where there is a filter extracting solid impurities from the flow of air, gas or liquids. With it, energy consumption can be monitored in real time and usage energy can be saved. As the end result, the usage costs of the device are reduced and personnel resources can be utilized on more important tasks.


The benefits of the process.

It must be noted that results cannot be achieved with the specifications included in the standards because each client and filtering site is individual.

The best economic results are achieved when a function that suits just it is custom-made for each filtering site.

An example of the benefit of the process is an air-handling machine, where the quantities of air in the incoming and outgoing air machine are about 5 m3/s.

When the operating time of the ventilation is the number of hours that the office or shop is open for in a year, savings of hundreds of euros can be achieved in electrical energy. In any case, so much electrical energy is saved that new filters and replacement work can be paid for with the amount saved on consumption.

What’s the best: the TFM program collects measurement data and makes use of it so that the saving benefit to the user does not disappear, but instead remains permanently, and the consumption will never gain return to the same level as before when the instructions provided by the TFM process are followed.

When we expand the area to include all the comparable usage sites of Finland, the number of machines already goes into thousands of units. The savings in the consumption of electrical energy and the reduction in carbon emissions are significant, both for the user and for society too.

In Finland, air-handling machines are installed with an air quantity of more than 3 m3/s, more than 2,000 units a year. The number of machines that are in use and installed after 2001 can be estimated to be as many as tens of thousands of units.

So there are thousands of potential sites in Finland!

How is the benefit to the user described above achieved?

General operating model

The operation of the air-handling machine is measured in real time with the sensors of the process and with the sensors that are a part of the air-handling machine.

Both machine parts, both in the incoming and outgoing air machine, use the same features of the process.

The program of the TFM process analyzes the measurement results and calculates the results. It sends the additional functions of the air individually at fixed times to selected persons.

If they are interested, the user can follow the trend on a computer display, which shows real-time measurement results for a period of 8–160 hours. This works on a computer, tablet or smartphone.

The user gets a notification in advance by text message about the economical moment for filter replacement. After receiving the message, they can read a report with action instructions in their own e-mail.

Reports and their content

The best usage cost effectiveness calculated is reported to the persons responsible for preparation for filter servicing as an advance notification in the service report.

The report, that is sent in advance, is at the same time a notification of the schedule of the coming filter maintenance. In this way, it’s possible to prepare for the work and order a replacement filter for the site. The service notification can also be sent in pdf form to the service organization.

A second notification of the service date is sent when the filter replacement is to be done. It’s also possible to send the service date to the foreman so that they can set aside work time to do the replacement.

The replacement of the filter

The filter replacement work is begun at the work site by first ‘checking out’ the measurement sensor of the TFM process. In this way, the process gets information about the event and sends a pdf-format report with all the savings and consumption figures in it.

The report for this is sent in advance to selected e-mail addresses.

The TFM server can also send a note to the service log of the property about the work performance and its start with a date stamp.

If there have been several filter changes, the cumulative values attained in previous operation periods will also be printed in the service report, along with power consumption, and CO2 emissions and the SFP figure of the fans, to be utilized in the client’s own energy-efficiency reports. The air-handling machine is to be designed and used in accordance with specifications so that its SFP figure is, and stays below, the threshold value set for it.

Fault alerts

The process includes a fault alert system which alerts maintenance if one of the following occurs:

  1. The pressure difference of the filter falls rapidly below the threshold value set
  2. The pressure difference of the filter rises rapidly over the threshold value set
  3. Communication problem with the Internet

In the first case, at least three possibilities exist:

  • the trapezoidal belts have broken,
  • the filter material is torn, or
  • the service hatch of the filter has been opened or it has opened by accident.

In the second case, at least three possibilities exist:

  • snow has got into the filter compartment and is blocking the filters, or
  • in the filter compartment, the filter surface is being covered, for example, by insulation material that has become torn away from the inner surface of the structure of the casing
  • the filters have not been replaced despite numerous notifications of the need for replacement.

In the third case, there is a fault in the electrical supply to the sensor, a problem with the server or GSM network or an error in the service action:

  • the program of the TFM process includes a so-called Watchdog feature which activates the program after the disruption has been removed; after this, the program is restarted and automatic measurement and calculation are begun.


Our process includes a feature with which, by analyzing real-time measurement results, the next replacement time of the filters can be forecast, with economic grounds.

The following are some of these economic benefits:

  • The number of service visits is reduced.
  • Additional inspection visits become unnecessary or are completely done away with, when the operation of the filters is monitored automatically.
  • The automatic monitoring free up service personnel for other tasks when they don’t have to monitor the condition of the filters themselves any more.
  • When the work of the personnel can be moved over to other tasks, this also reduces the costs of the investment in the TFM process.
  • The process maintains filter lists in which there is the model, filter type, a description of the structure and the number of different models.

Cost savings arise when filters no longer have to be kept in the storage areas of the client or on the floor of the machine room.

The TFM process notifies the contact supplier responsible for filter maintenance of the need for filter replacement and orders the filters automatically. The delivery comes to the service site at just the right time.


The cost-effective process can be customized affordably and expanded in accordance with the customer’s wishes.

At renovation and new building sites, the process replaces the pressure difference or flow monitoring transmitters of the filters of the ventilation machine that are traditionally a part of property management.

Alerts can be transferred to property management as digital information.

The costs of our process in adoption and the time used for that are slight.


When four measurement sensors are added to the TFM process, the heat recovery efficiency coefficient is calculated, along with the annual efficiency coefficient, in real time.

The reports of the TFM process can be stored from the server and transferred safely in the best-known formats for inspection by the authorities or for the use of investigators.


The sensors of the TFM process have been installed at many sites for research purposes, in order to increase experience of the use of the process.

Since 2009, we’ve been developing a process that would give the user actual real-time information about the energy consumption of the flow system and the possibility to save costs and energy, and help to make choices about better operation during the life cycle of the device.

We have numerous test installations in Finland, which we monitor on the Internet.

In 2015, we obtained the right for the utility model in Finland, and in 2016 we obtained US patent 9291487 B2 for the TFM process.

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More information about TFM, contact mr. Seppo Rausio by e-mail

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