I know air con systems have been mentioned , but what about warehouse gas blown heaters , they are about 15 ft high , suspended from the ceilings , draw the air into the back of the unit , heat the air (gases displaced outside) and the warm air blown into the work area. 

These are large areas so not a confined spaces but naturally as the temperatures are dropping they are not wanting doors open for ventilation either. 

Anyone any advice as this has just been flagged as a concern. 

Thanks in advance 

A system that passes air, at height and well above the normal breathing level, across a heating element at XXX degrees versus Covid carried in droplets under gravity always heading towards the ground.

Why is the human race so determined to find excuses why we should not do something - Kennedy and the US space dream would be spinning in his grave.

Lets all go home, find a dark corner, curl in a ball and await the inevitable.

Very annoyed to hear some clever clip board clown believes it fine to have a school sat in class with coats on so they can have the heating off and windows open. Sorry, if it is such a risk send them home - "when I were a lad" and the oil heating failed we were sent home not asked to catch colds.

http://www.warmco.co.uk/ as example of the type of heaters being discussed which remain common in the UK

Well let’s see, the heater is suspended up near the ceiling and I assume this is at least 3 m from the ground. If someone sneezes or coughs it is extremely unlikely any of the larger virus respiratory droplets (< 5 µm to 1000 µm) will travel that far up.  Smaller airborne droplets (> 5 µm) may be carried higher but they tend to dry out quicker and lose viability.

If the blower sucks in virus laden air and blows heated air out I can’t imagine the virus particles remaining viable. Heating even to 50 °C will take out most viruses.

Of course, we don’t know any of this for sure. It’s a new virus and working with viruses and working out what they re actually doing  in real life is difficult which is why a lot of the stuff we talk about is more like educated guesswork than facts, but it all we have and the only alternative is to go home and wait for the virus either to go away of it’s own accord or hope that a effective vaccine appears. Don’t hold your breath.

Edited by user 29 October 2020 09:59:05(UTC)  | Reason: words and thgings