The only valved holding chamber (VHC) available with the Flow-Vu  indicator When patients have trouble using Metered Dose Inhalers (MDIs), the medication that the 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 Anti-Static Valved Holding Chamber (aVHC) helps patients inhale MDI medications correctly. AeroChamber Plus Flow-Vu aVHC is a device available by prescription only for patients who may have difficulty with the coordination and control involved in using MDIs correctly. Go with the “Flow-Vu“ AeroChamber Plus Flow-Vu Anti-Static Valved Holding Chamber (aVHC) is a device available by prescription only for patients who may have difficulty with the coordination and control involved in using Metered Dose Inhalers (MDIs) correctly.