This is easily done and I have used anaesthesia machines as ICU ventilators.
Be sure to:
1. Use a new disposable circuit
2. Take off any agent vaporizers
3. Place the CO2 absorber in the 'Off Line' position
4. Use a HME
5. A FGF of 6-8 lpm is adequate for average adultshttps://healthprofessions.udmercy.edu/academics/na/agm/09.htm