This is an inexpensive alternative to the bacterial viral filter for expiratory only testing. It fits most pulmonary function test equipment, including peak flow meters. An adaptor may be required.
A 22mm diameter mouthpiece is also available for paediatric use or for elderly test subjects who have difficulty fitting their mouth properly around the standard mouthpiece size.
- For use with peak flow meters and spirometers.
- One-way valve prevents accidental inhalation.
- Completely disposable.
- A low cost alternative to BVF for expiratory testing.