AeroChamber Plus Flow-Vu Anti-Static Valved Holding Chamber (aVHC) helps the patients who have trouble using Metered Dose Inhalers (MDIs), like the medication that MDIs dispense may end up on the tongue, on the back of the throat or in the air rather than in the lungs. AeroChamber Plus Flow-Vu is a device available by prescription only for patients who may have difficulty with the coordination and control involved in using MDIs correctly.