How purified office air could still be full of germs

Unwell at work
You’re only as safe as the air you breathe – and everybody else breathes it too

You should be OK with purified air. But every system has its drawbacks.

Which means you may not be as safe as you think you are – even with the latest triple-whammy set up.

One reason is how most purifying systems work.

Passive instead of active.

A great big fan system sits in one place, sucking air through it. Filters next to the fan sift out contaminants – and the air goes round again, circulating for reuse. Purified.

HEPA efficiency

That’s usually pretty good with High Efficiency Particulate Air (HEPA) systems, which filter out particles down to a very small 0.03 microns.  Fine for fumes and exhaust sucked from outside, as well as smoke, dust, emissions from from building materials, furnishings, cleaning products, electronic equipment, toiletries, people and pets.

Not so fine for harmful viruses, bacteria, protozoa and fungi – which are often very much smaller. A typical cough-sniffle cold bug like rhinovirus might be as small as 0.002 microns. Too small to be filtered out, too light for gravity to affect it. So it rides the air, round and round – waiting for us to breathe it in. Not purified.

An efficient alternative is to use ultraviolet light. A fan draws air in through a long exposure tube – the “killing zone”. Ultraviolet attacks the microorganism’s DNA, rendering it unable to reproduce. If contact is long enough, it becomes neutral and effectively dead.

But how long is long enough? To make sure of a kill, the air has to move fairly slowly. It can’t recirculate fast like the HEPA filter – unless it has a whacking great bulb. And if the bulb is too big, it produces too much ozone – an effective antimicrobial, yes, but hazardous to humans.

Those are the passive systems. Air goes to the germ-killer, not the other way around. It works only where there’s airflow. In quiet corners and along walls, the air is still and unmoving. Particulates and microbes are there for keeps. Not purified.

Active – go get ’em

More effective is to be active – to take the germ-killer to the air. To force it out positively, driving it to disperse in all directions pro-actively. To invade the air totally.

The vehicle is a dry ultra-fine hydrogen peroxide mist, which kills germs by oxidising them. The mist is ionised to become a plasma, forcing itself away in all directions, penetrating everywhere.

The actual solution is mild, only 6%. But ionising transforms it, producing further antimicrobials – hydroxyl radicals, reactive oxygen species, reactive nitrogen species, ozone and ultraviolet. From eco-friendly 6%, to turbo-charged 600%.

Electrostatic attraction causes oxygen atoms to grab oppositely charged viruses and bacteria. They are physically ripped apart – and the mist safely reverts to oxygen and water, which evaporates. Sterilised, purified, safe and secure.

OK, there is a downside.

Hydrogen peroxide won’t take out non-biological contaminants with anything like the same efficiency. Pollutants like volatile organic chemicals (VOCs), gases such as nitrogen dioxide, ozone and carbon monoxide, particulate matter and fibres are better removed by the regular HEPA filters.

But work the two together…

Picture Copyright: pressmaster / 123RF Stock Photo

Back Off, Bacteria! is the blog of Hyper Hygiene Ltd, supplier of what we’re convinced is the most effective health protection system in the world. A fully mobile, all-automatic Hypersteriliser machine mists up workplaces with ionised hydrogen peroxide, spreading everywhere and eliminating all bacteria, viruses and fungi.

Hypersteriliser units are supplied to businesses and institutions across the UK, notably the haematology and other critical units at Salford Royal Hospital, Greater Manchester; Doncaster & Bassetlaw Hospital; South Warwickshire Hospital; Coventry & Warwickshire Hospital; and Queen Victoria Hospital, East Grinstead.

The Halo Hypersteriliser system achieves 6-log Sterility Assurance Level – 99.9999% of germs destroyed. It is the only EPA-registered dry mist fogging system – EPA No 84526-6. It is also EU Biocide Article 95 Compliant.

Originally posted on 9 June 2017 @ 5:04 pm

Originally posted on 9 June 2017 @ 5:04 pm