A closed mask breathing system with integral 3M™ filter maintains respiratory isolation during oxygen and drug nebulized therapy, reducing the risk of airborne infections such as SARS and influenza. All exhalation is filtered through 3M™filter which protects both healthcare workers and patients. The extra large oxygen reservoir ensures oxygen concentration levels between 30% to 90% while intake valve allows patient to make-up air from atmosphere if necessary. 100% latex free and disposable. This model available in small adult size, see 6100 for adult size and 6110 for child size. Case of 50.