Infection risks & mitigation

CIBSE advise for safe working area’s

To minimise the risks of airborne transmission of SARS-CoV2 / COVD-19 the general CIBSE (The Chartered Institution of Building Services Engineers London - https://www.cibse.org/coronavirus) advice is to increase air supply and exhaust ventilation, supplying as much outside air as is reasonably possible. The underlying principle is to dilute and remove airborne pathogens.

Airborne transmission

Mounting Evidence for Airborne Transmission

While evidence for airborne transmission of COVID-19 is currently incomplete, several studies are underway; With the majority of the released or early findings from these studies testing positive samples for SARS-CoV-2 genome (RNA) within in the air.

This is also in keeping with the findings for other respiratory viruses, including SARS-CoV, MERS-CoV, RSV and influenza, with both short-range and longer-range airborne transmission being possible. Previous studies of general viral transmission have also provided strong evidence for indoor airborne transmission of viruses, particularly in crowded, poorly ventilated environments.

Market demand for HEPA Filters

In poorly ventilated spaces with a high occupancy and where it is difficult to increase ventilation rates it may be appropriate to consider using air cleaning and disinfection devices.

The most appropriate devices are likely to be local HEPA filtration units or other disinfection devices .Although ongoing studies are reviewing the effectiveness of HEPA filters to remove Covid-19 from the air, HEPA filtration / increased filter efficiencies are being specified.

Supplying a safe amount of air?

REHVA advise for improved air flows

With the recommendation to run ventilation at higher volume / flow rates to directly supply fresh air; changing CO2 set points, coupled with other recommendations from increased air flow through natural ventilation (windows), reduced occupancy & increased social distancing practices; There are multiple considerations to make in order to ensure a safe environment for ventilated areas.

Reviewing the requirements for safe practices for the amount of air to supply, the REHVA (Federation of European Heating, Ventilation and Air Conditioning Associations) guidance FAQ also offers some insight for the best ventilation working practices:

REHVA FAQ – Recommended rate of air exchange for workplace
Existing standards in non-residential buildings lead to about 10 L/s per person; Researchers are studying if this value should be increased to 20-25 L/s per person – with research ongoing on Covid-19.

REHVA FAQ – Level of occupancy considerations
The amount of litres per person fresh air needed is directly related to occupancy. The amount of fresh air / ventilation rate per person matters, this can be increased by lowering the occupant density, or increasing air flow for higher occupancy density areas.

Fan selection considerations?

What does this guidance mean to your fan selection?

  • To help ventilate areas with increased air changes; An increased air flow within normal unit & duct sizes is required, creating higher velocity systems. This will have a knock-on effect of increasing system pressures & power requirements for the fans to work against.
  • Introduction of HEPA filters into the system will increase the unit pressures, increasing the fan working parameters.
  • Taking current Building specifications into account and the revised recommendations to have safety built into system for higher air flow and pressures, Plug fans, using AC Motors, should be considered to achieve adequate Ventilation.
Higher pressure and volume needs Comefri plug fans

How this will change your system & fan selections

The right fan to keep you safe?

As best practice denotes, fans will still need to be selected for optimum efficiency at normal working conditions, but also have the capability for a duty increase to supply additional air during high risk periods, or when high occupancy of an area is expected.

The performance charts below highlights the difference in performance envelope between a High pressure plug fan (in this case our NPA range) vs the normal maximum you could expect to see on an EC equivalent plug fan.

Higher pressure and volume needs Comefri plug fans
Comefri plug fans performance

The Coronavirus has spread fast and seriously affected our lives and businesses worldwide but in spite of the fact that Italy is one of the countries where this virus has hit hardest, Comefri SpA has kept going, kept producing and kept supplying our fans where they are needed.

We are proud to say that the Comefri Group is making a significant contribution to the war against this pandemic.

In fact, our fans have recently been installed in a large number of hospitals, which have been built or converted in record time to help cure Covid-19 patients around the world.

Here is a list of some of those hospitals:





  • Ospedale Maggiore Bologna
  • Presidio Ospedaliero Santo Spirito – Pescara
  • Ospedale Sacco Milano
  • Ospedale Niguarda Milano
  • Ospedale Covid Civitanova Marche
  • Varna St. Marina - Bulgaria
  • Guy’s Hospital, London
  • Great Ormond Street, London
  • Torbay Hospital, Devon
  • Freeman Hospital, Newcastle-Upon-Tyne
  • Kingston Hospital, London
  • Royal Berkshire Hospital, Reading
  • John Innes Centre, Norwich
  • Queen Elizabeth Hospital, Birmingham
  • Filton Blood centre, Bristol
  • Whittington Hospital, London
  • İstanbul Sancaktepe Sahra Hospital
  • Ankara Etlik Integrated Health Campus
  • Gaziantep City Hospital
  • İstanbul İkitelli – Başakşehir
  • İzmir Bayraklı City Hospital
  • Kocaeli City Hospital
  • Isparta Eğirdir Goverment Hospital
  • Bitlis Ahlat Goverment Hospital New Building
  • Afyonkarahisar Sinanpaşa Goverment Hospital
  • Samsun Training and Research Hospital Additional Polyclinic Building
  • Mersin City Hospital
MCE logo

MCE 2020 was posponed to September 2020.

Comefri SpA is participating to the 2020 MCE Mostra Convegno Expocomfort in Milan, 17-20 March 2020.

Visit us at Hall 9 - Booth R23

MCE 2020: THE ESSENCE OF COMFORT

MCE symbolizes the fullest synthesis of housing comfort in the future. Essence lies at its core and represents the soul of living pleasure.
MCE website.

Comefri is pleased to announce the completion of n.4 Atex Axial Fans Φ900mm in A316L and blades in Aluminum with Heresite coating. The final use is in the Oil&Gas industrial sector.

Once again, Comefri consolidates its presence in the Oil&Gas sector by widening the supplies with its own Axial Fans.

Axial Fan Comefri Axial Fan Comefri
AHR 2020 logo

Comefri USA is participating to the 2020 International Air-Conditioning, Heating, Refrigeration Exposition in Orlando– February 3-5 2020.

Visit us at Booth #3781 – West Hall

AHR Expo 2020 takes place in
Orange County Convention Center
9800 International Drive
Orlando, Florida 32819

The AHR Expo is the world’s largest HVACR event, attracting the most comprehensive gathering of industry professionals from around the globe each year. The Show provides a unique forum where manufacturers of all sizes and specialties, whether a major industry brand or innovative start-up, can come together to share ideas and showcase the future of HVACR technology under one roof. Since 1930, the AHR Expo has remained the industry’s best place for OEMs, engineers, contractors, facility operators, architects, educators and other industry professionals to explore the latest trends and applications and to cultivate mutually beneficial business relationships.

Visit our on-site subsidiary: COMEFRI USA www.comefriusa.com for more info.

Comefri stand at AHR Expo 2020

We warn all our partners that the use of trademark and/or brand “Comefri” shall be considered authorized and lawful only if it concerns the products manufactured by one of our factories, which are exclusively the following:

Comefri Italy - Comefri Gmbh - Comefri UK Ltd - Comefri France - Comefri USA - Comefri China - Comefri Fan Systemleri (Turkey)

Please verify all the products labelled “Comefri” at your disposal and contact us whenever you find products which are not manufactured by one of the aforesaid factories.

Further, consider that the use of the trademark and/or the brand “Comefri” by third parties is unauthorized and unlawful without our prior formal authorization.

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