The fourth pillar: the ALISEAL® System for the elimination of air leaks in air ducts

Air leaks inside the air ducts present a problem in terms of energy, costs and hygiene

Many people believe that air ducts are and will always remain sealed and airtight, ensuring excellent flow, hygiene and a good balance. Unfortunately this is not the case. More than 60% of air systems have pipes with leaks and cracks. And the problem does not only concern old plants, but also those of new construction.

First, a plant with fissured ducts that shows pressure drops needs a greater amount of energy to circulate air through the building. Considering that the power required to operate the fans represents 20-60% of the total energy consumption used by the air treatment plants, we can see how a simple 15% reduction in losses can reduce the fan's energy needs by 40% and save thousands of euros every month.

Secondly, leaks in the air ducts disperse the along an undesired  path and therefore requires a greater quantity of external air into the building, in order to be able to convey it in all the rooms served by the system in the right quantities. The extra air coming from outside must be heated, or cooled, and this causes a significant increase in the energy cost necessary for the operation of the plant.

Finally, pipeline leaks have been linked to poor indoor air quality, poor humidity control and health risks, such as the "sick building syndrome" and the spread of mold and other infections within building.

To solve the problem, slow, inefficient, costly systems have been used to date which, above all, have never led to a definitive solution: the use of adhesive tape and the replacement of the piece of channel that is the object of the loss are the most commonly adopted solutions.

But both are not very effective: the adhesive tape comes off after a short time and does not guarantee adequate closure of the cracks, while replacing a part of the system generates very high maintenance costs, in addition to the inconvenience caused to those occupying the rooms served by the plant itself.

Let’s not forget about  the difficulty in identifying exactly where the cracks are located: it is a few millimeters of loss on ducts tens of meters long.

But the solution exists. And it's called ALISEAL®.

ALISEAL® is an innovative technology for sealing installed ventilation systems from the inside and can be used for existing air ducts, as well as during the installation of new systems.

ALISEAL® quickly and efficiently reduces losses in ventilation systems by an average of 90%.

During the sealing procedure with ALISEAL®, a sealant is sprayed with the aid of compressed air and heat and made to flow into the pipeline through a fan. Subsequently, the aerosolized particles are deposited in the points of loss of the system, but not on their intact surface. Through this process the non-hermetic points with a diameter up to 1.5 cm are sealed and resist a maximum pressure of 2,000 Pa.

The great efficiency of this system makes it possible to stay below the requirements of tightness class D, according to DIN EN 1507, DIN EN 12237, DIN EN 12599, Eurovent or DW144 TM1.

A further advantage of ALISEAL® is the speed of the sealing process. The application does not require any long-term building closures as it is possible to return immediately to the premises treated.

Such rapidity cannot be guaranteed with a traditional method of sealing air treatment systems.

In addition to achieving an unprecedented level of airtightness , ALISEAL® greatly increases the comfort of buildings, since it significantly reduces the loss of heat or cold caused by non-hermetic pipes and guarantees a homogeneous distribution of heat and cold in the entire building.

ALISEAL® meets the most stringent requirements regarding hygiene criteria: the sealant does not present a health risk and can therefore also be used in buildings such as schools, hospitals and other public offices.

ALISEAL® is a certified system, like all Alisea interventions.

Before and after sealing, the ALISEAL® system performs a test aimed at determining the total loss of the plant. Through this process at the end of the intervention, a certificate is issued in which the percentage of reduction of air loss in the system and all the technical data of the intervention is indicated.

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