Here is an inhaler mask for cats dealing with asthma, allergies, and bronchitis. The AeroKat Aerosaol Chamber is designed to reduce meditation waste. It has 2 silicone masks to fit all cats. It has an antistatic chamber to hold meditation longer.
The AeroKat chamber comes with the Flow-Vu indicator to let you count as your cat takes the 10 breaths required to empty the chamber. You can find out more about it here.