Sealing of air pipe systems

The Procedure

gesaAeroseal seals leaks

What is gesaAeroseal®?

gesaAeroseal®  is a patented breakthrough technology that tackles duct leaks from the inside out.
It can be applied to existing or recently constructed duct systems. gesaAeroseal®  duct sealing is used in commercial buildings around the world to increase energy efficiency and to set new standard regarding comfort and indoor air quality.

How does gesaAEROSEAL® work?

The gesaAEROSEAL® process puts escaping air under pressure and causes polymer particles to stick first to the edges of a leak, then to each other until the leak is completely sealed. Over time, leaks to a diameter of 1,5 cm can be sealed. These seals resist withstand pressure up to 2.000Pa

Aeroseal_hose to duct
Aeroseal in use at the customer

What needs to be considered when using gesaAEROSEAL®?

The entire process just takes a few steps. In a first step, all air-inlets and -outlets will be closed with metal panels, foam mats, sealing balloons, or MEZ-DUCT-WRAP – depending on the requirements. Generally, we avoid blowing sealant materiel through VAV boxes or fire/smoke dampers, however laboratory and field testing have shown that under the right circumstances this can be done without adverse consequences. However, we recommend disconnecting ventilators or recuperators and to remove or mask VAV boxes or fire/smoke dampers. Under no circumstances can sealant material be blown through VAV boxes with reheat coils.

Advantage 1 - Tight air duct systems

Limited access to the duct systems due to the characteristics of the building, leaks that are made up of many small leaks, and many other reasons make the detection of leaks air duct system extremely difficult. By using gesaAEROSEAL none of above matters. When it comes to sealing ductwork, gesaAEROSEAL achieves results that can only be achieved through very elaborately sealed air ducts. Due to the high efficiency of subsequent sealing it is possible to achieve or to be well below the requirements for air tightness class D, as per EN 1507, EN 12237, EN 12599, Eurovent or DW144 TM1. gesaAEROSEAL reduces the leakage of air duct systems in no time by an average of 90%

Advantage 2 - Speed

Further, gesaAEROSEAL® convinces users by the speed of the sealing process since no long lasting setup of the system is required and the building or building sections in question (e.g. in existing hotels) can be used again immediately. For the process, just 2 or 3 service technicians are necessary - this results in reduced time and staff expenses that would not be possible with conventional sealing methods.

Advantage 3 - Increased comfort and hygiene

gesaAEROSEAL® improves the level of comfort of buildings significantly, since the heating or cooling losses through leaks is substantially reduced and thus an even distribution of heat and cold is guaranteed throughout the entire building.Regarding hygiene, the gesaAEROSEAL technology increases the entire level of hygiene. The sealant meets the requirements of the hygiene guideline VDI 6022 and thus has no adverse health effects. It may be used in all building such as schools, hospitals and other public facilities.

Advantage 4 - Documentation

Before and after sealing process, the total leakage of the system is determined and documented in a certificate that will be handed over to the customer after the application. Also, the percentage of the leakage reduction is shown.

Advantage 5 - Energy savings

The European guideline Energy Performance of Buildings Directive (EPBD) sets detailed targets regarding the level of energy saving. These targets are further implemented through national laws and guidelines such as the German Energieeinsparungsverordnung (EnEV). If your air ducts have not been analysed yet, a leakage of 15% is expected. By achieving an airtightness class A, this leakage can be reduced to 6%

Advantage 6 - Carbonite Footprint

Today, companies are no longer exclusively obliged to their shareholders, but must also be aware of their social responsibility. gesaAEROSEAL® helps companies to deal responsibly with the limited resources of our planet and thus preserve the environment for our children and grandchildren. 

By way of comparison, to compensate for the CO2 emissions caused by leakage losses in HVAC systems according to EnEV 2009, approx. 136 spruces need to be planted each year if the airtightness class is unknown. After reaching the airtightness class B only 18!

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