Extraction with heat recovery

[Rollin]

Our dental surgeries are going to need a ventilation system to reduce risk of corona virus transmission.
It will also reduce the amount of time that we have to wait between patients to allow aerosols to settle prior to cleaning/disinfection procedures.
It appears that a 'air changes per hour' of around 15 would help a lot. the surgery rooms are about 40m3 each and have suspended ceilings.
Does anyone have any experience supplying these things?
Is it possible to have one unit to service 2 adjacent surgeries?

[Rollin]

I pretty much know nothing about this. I assumed that heat recovery would prevent the rooms from being left freezing cold during the air extraction.