Inclusion Criteria:  18 years of age or older ASA 1 or 2 Receiving a general anaesthetic for non-emergent surgery  Exclusion Criteria:  ASA score ≥3 BMI ≥ 30 kg/m2 Nasal obstruction Baseline SpO2 ≤95% on room air Anticipated difficult airway management Requirement for awake intubation Pregnancy Positive PCR test for coronavirus in preceding 14 days.