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Hi,

After a bit of advice regarding extractor fans for a dental surgery. Due to the ongoing Coronavirus crisis I've been asked to install extractor fans to a dental practice I occasionally due maintenance for.

Due to the high risk of airborne particles from certain procedures they would have to wait an hour between patients before they could safely let anyone in. To get around this they've been advised they can install extractor fans in each surgery (3 in total). The internal doors are to be sealed shut so each surgery would require an inlet vent and the extractor fan.
They're aiming for 10 air changes per hour for each surgery.
Each room is about 50m3
So am I right in saying that they would require a fan with an extraction rate of about 500m3 per hour?

Fans have to be wall mounted so can't use Inline fans.
From what I can tell no standard 6" fan comes close but 9" fans do.
Does anyone have experience of installing 9" fans and the type of core drill required as I'm guessing my standard makita core drill wouldn't be up to the task?!

Any other advice would be very welcome as I wouldn't claim to be an expert in this field!

Thanks
 
A very interesting query.
I am golfing with my dentist tomorrow, so I have printed out your post and will ask him to comment. He has already told me that when he goes back to work next week he will have to limit the number of patients per hour, and i expect it is at least partly due to the airborne particles you mentioned. He is a very mechanically minded chap, and I expect he will know the ropes on this.
 
Hello All, I have been working with a dental surgery , HVAC and electrical company and we developed a portable extraction system. If anyone is interested , please let me know and I can send over some of the specifications.
 
The main problem will be where the air comes onto the room, if its not at the other end of the space the required air change will not happen, in one and straight out the other if they are close together, in any case the inlet will need to be filtered probably down to at least one micron, maybe less the Dentist will know how fine it should be, you then have to consider where the extracted air is going, possible into a filtering unit to ensure the contaminated air does not effect anyone else, to me this sounds like a job for a false ceiling and proper air control units outside the room.
 

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