Buildings as a preventive barrier against COVID-19

Situations like COVID-19 are not isolated episodes

In the last 17 years, there have been at least 6 outbreaks (including the current one) capable of affecting the global population (SARS, MERS, Avian Flu, ZIKA and EBOLA).

Valuable work can be done by improving the indoor environmental conditions of office buildings to prevent the impact of situations like COVID-19.

Transmission of SARS-CoV-2 by air is sufficiently likely that airborne exposure to the virus must be controlled. Changes in the way buildings operate, including air conditioning and ventilation systems are required.

Installations in buildings play a key role in COVID-19 like situations: Ventilation, air flows and filtration help reduce the concentration of SARS CoV 2 in the air and therefore, the risk of airborne transmission.

What measures can be taken?

Ventilation and filtration provided by air conditioning, heating and ventilation systems and installations can reduce the concentration of SARS-CoV-2 in the air and therefore, lessen the risk of airborne transmission.

Unconditioned spaces can cause heat stress in people, posing a direct threat to their lives and reducing their resistance to infection.

ASHRAE recommends HEPA particulate air purification units (“High-efficiency particulate air”) (Evidence Level A).

Both UVGI light and its more powerful version, photocatalysis, recommended as ASHRAE Level A, are being used more and more frequently in ventilation systems. One of its main functions is to lower the microbial load in buildings. (Evidence Level A)

Sistemas SIAV®


Aire Limpio has SIAV® systems, purifying units comprising four stages of filtration:

  • Filter F9 Epm2.5>90%
  • Photocatalysis with TiO2 coated ceramic activated carbon monolith
  • UVGI Germicidal Ultraviolet Light Irradiation
  • HEPA Filter 99.95%


SIAV® systems reduce ventilation costs by optimising the supply of primary air and the indoor thermal load.

They improve indoor air quality by filtering airborne pollutants in the places where they act, creating an overpressure to reliably prevent the entry of polluted air into adjacent areas.

They operate as stand-alone systems, that are installed in false ceilings in high-occupancy-density areas.

These units are particularly useful in buildings in use or in projects, specifically for the areas indicated below:

  • High-occupation-density areas
  • Meeting rooms
  • Dining rooms/vending
  • Communal areas (lift landings, etc.)


SIAV® systems reduce ventilation costs by optimising the supply of primary air and the indoor thermal load.

SIAV® systems have a flow range from 400 m3/h to 2,000 m3/h that can be used in several ways:

  • As a highly-efficient air purifier, installed in a false ceiling for high-occupation-density areas. In this mode we recommend 5/6 air movements per hour.
  • As a ventilation system, optimising air conditioning costs by reducing the supply of primary air
    and the thermal load for ventilation.

As an air purifier, the reduction of pollutants is immediate due to the combination of integrated filters.

In addition, it is especially effective with biological pollutants as the effect is closer to people and airborne particles (to which COVID 19-type viruses often become attached).




and of cooling/heating capacity in the thermal load balance


Reduction of incidence of airborne diseases


and of installation diffuser elements


SIAV filtration levels are higher than required


It only requires one outdoor air intake


Lower consumption compared to traditional recovery systems

Technical data

AL2508-SFEG ePM2.5>90% (F9) Activated carbon FOAM UVGI 254 nm HEPA 99,5% 800 120 310 307 x 624 x 1.033
AL2516-SFEG ePM2.5>90% (F9) Ceramic Monolith
TiO2-impregnated activated carbon
UVGI 254 nm HEPA 99,5% 1.200 140 281 367 x 667 x 1.069
AL2524-SFEG ePM2.5>90% (F9) Ceramic Monolith
TiO2-impregnated activated carbon
UVGI 254 nm HEPA 99,5% 2.000 125 551 367 x 967 x 1.069

Dimensiones AL2508-SFEG

Dimensiones AL2516-SFEG

Dimensiones AL2524-SFEG

Examples of installations

Zurich Seguros. Blue Building


Zürich is one of the world’s leading insurance companies, with more than 130 years’ experience in Spain. As building owner and in line with company values, they carry out the project, achieving a building in accordance with current quality standards, regulations and the company’s energy efficiency and corporate image requirements.

This building includes the very best technical specifications and a hybrid air conditioning system that is the first of its kind in Spain. Its excellent floor-plan design enables great flexibility and the adaptation of spaces to all types of companies.


In order to meet RITE regulations and comply with the ASHRAE 62.1-2010 standard to obtain the LEED® PREREQUISITE in Indoor Air Quality, 27 Integrated SIAV® Systems for Ventilation Savings have been installed.

Sistemas de ahorro en la ventilación SIAV®
Model AL 25.16
Nº of Units 27
Flow 1.600 m3/h
Filter V8 de Polarización Activa
Particle filtration HEPA H13 99,97%
Filtration of gases CPZ Eficacia 90%


Well-being of customers and workers

Contribute to your customers’ experience with excellent Indoor Air Quality

Achievement of sustainable, energy-efficient buildings

Savings in maintenance costs

Compliance with RITE regulations

Attainment of Leed credits


Energy & Atmosphere

Indoor Environmental Quality

Konecta BTO. Sede en Barcelona


The KONECTA BTO Group is a reference in the Contact Centre sector. Present in 10 countries, it offers services in a wide variety of sectors such as telecommunications or banking.

The Konecta Media Department has carried out, together with Aire Limpio, actions to improve indoor air quality at its Barcelona office located at Calle Marqués de Sentmenat, 35.


Aire Limpio has carried out the design and installation of SIAV® systems in the Basement and First Floor of the building. These systems comprise three stages of filtration F7, HEPA H13 and Activated Carbon.

Sistemas de ahorro en la ventilación SIAV®
Model AL-25.16G
Flow 1.600 m3/h
Filtration Polarización Activa. V8 98% / HEPA 99,97%
Filtration of gases  CPZ Eficacia 90%


Increase in ventilation flows

Reduction in the concentration of CO2 and airborne particles

Energy and cost savings

Reduction in the concentration of VOC (Volatile Organic Compounds) and Gases

Reduction in the incidence of cyclical diseases, allergies and other pathologies

Compliance with RITE (Regulations on Thermal Installations in Buildings)


Energy & Atmosphere

Indoor Environmental Quality


Other practical cases


Otros casos prácticos

Ernst & Young

Fecha: Octubre 2016
Edificio: Torre Titania
Tecnología: SIAV

Savills Aguirre Newman

Fecha: Julio 2018
Edificio: Pº Castellana, 81
Tecnología: SIAV


Fecha: Noviembre 2013
Edificio: Torre DKV, Zaragoza
Tecnología: SIAV

Savills Aguirre Newman

Fecha: Julio 2018
Edificio: Pº Castellana, 81
Tecnología: SIAV

Savills Aguirre Newman

Fecha: Julio 2018
Edificio: Pº Castellana, 81
Tecnología: SIAV

Savills Aguirre Newman

Fecha: Julio 2018
Edificio: Pº Castellana, 81
Tecnología: SIAV

Savills Aguirre Newman

Fecha: Julio 2018
Edificio: Pº Castellana, 81
Tecnología: SIAV

Savills Aguirre Newman

Fecha: Julio 2018
Edificio: Pº Castellana, 81
Tecnología: SIAV

What does the scientific community say?

Position Document on Infectious Aerosols


“La filtración de partículas de alta eficiencia en los sistemas centralizados de HVAC reduce la carga aérea de partículas infecciosas (Azimi and Stephens 2103). Esta estrategia disminuye el transporte de agentes infecciosos de una zona a otra, cuando estas comparten el mismo Sistema centralizado de HVAC a través de la impulsión de aire recirculado. Cuando se seleccionan e implementan adecuadamente, las unidades de filtración de alta eficiencia en un único espacio (ya sea montadas en el techo o portátiles) pueden ser altamente eficaces para reducir o disminuir las concentraciones de aerosoles infecciosos en este espacio“.
“La luz UVGI inactiva microorganismos al dañar la estructura de los ácidos nucleicos y las proteínas a nivel molecular. El más importante de estos es el ácido desoxirribonucleico ( que es responsable de la replicación molecular). Un organismo que no puede reproducirse ya no es capaz de causar enfermedades. (Nivel de Evidencia A)”.

A.Highly recommended; good evidence.

B. Recommended, at least consistent evidence.

C.No recommendation for or against; benefits and harms too closely balanced to warrant a recommendation.

D.. Recommend against; consistent evidence is ineffective or the harm outweighs the benefit

E.. Insufficient evidenceto make a recommendation for or against on a routine basis

The inactivation effect of photocatalytic titanium apatie on SARS Virus

Han Wei, Zhang Banhe, Cao Wuchun, Yang Dongling, Taira I, Okamoto Y, Arai JI, Yan Xiyun

“Photocatalytic titanium apatite filter (PTAF) is a new material that has been reported to have an ability to absorb and inactivate bacteria.

The inactivation effect of PTAF on serious acute respiratory syndrome coronary virus (SARS-CoV) was tested. The results showed that PTAF filter inactivated/ decomposed SARS CoV up to 99.99% after 6 h interaction under the condition of
non-UV irradiation. However, under the condition of UV irradiation, PTAF and HAF both were able to inactivate/decompose SARS CoV completely. The study has provided the first evidences that PTAF could inactivate SARSCoV virus, suggesting that the PTAF material will be applied for the prevention of SARS-CoV as well as other viruses”


Protocol for the reoccupation of buildings during the COVID-19 pandemic

Paulino Pastor, General Director of Ambisalud

“Install local air filtration and purification units, either fixed or portable units for temporary back-up. These units should preferably include HEPA grade filters, and it is recommended that they incorporate UV lamps or even photocatalysis.

Select back-up purification units capable of treating sufficient air flow to achieve a significant number of movements per hour of the indoor air”.

protocolo de reactivación de edificios durante la pandemia por COVID-19

In summary

Offices should integrate systems and practices that promote the health and well-being of their occupants, thus making offices more resilient spaces and better armed against physical pollutants and microorganisms

Aire Limpio offers the different technologies that are recommended by reputable world organisations.

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