An aero spacer is an add-on device used to increase the ease of administering aerosolized medication. The spacer adds space in the form of a tube or "chamber" between the canister of medication and the patient’s mouth.
The peak expiratory flow (PEF), also called peak expiratory flow rate (PEFR) is a person's maximum speed of expiration, as measured with a peak flow meter, a small, hand-held device used to monitor a person's ability to breathe out air.