the oxygen flow is left on, oxygen delivered into the ventilator tubing may accumulate within the flow generator enclosure. Oxygen accumulated in the CPAP or bilevel device enclosure will create a risk of fire. This warning applies to most types of CPAP or bilevel flow generators.
•Please refrain from smoking while oxygen is in use.
Note: At a fixed rate of supplemental oxygen flow, the inhaled oxygen concentration will vary, depending on the pressure settings, patient breathing pattern, mask selection, and leak rate.
FITTING THE MASK
The RESMED HOSPITAL NASAL MASK is supplied fully assembled.
1Connect one end of the main air tubing to the flow generator and the other end to the swivel. Turn the flow generator on. See “Technical Specifications” for information on which flow generator setting to use.
2Place the mask cushion over the patient’s nose and pull the headgear over their head.
3Unfasten and gently tighten the headgear straps to achieve a secure and comfortable fit. Adjust the top strap first. Then adjust the side straps, making sure that they pass below the patient’s ears. Do not overtighten the straps.
4The fitted mask should look like this:
headgear
top strap
mask
side strap 
elbow swivel
5If the patient feels air leaks around the cushion, reposition the mask on the patient’s nose to achieve a better seal. You may also need to readjust the headgear straps.
REMOVING THE MASK
To remove the RESMED HOSPITAL NASAL MASK, unfasten one of the side headgear straps and pull the mask and headgear up over the patient’s head.