1. 2. We are a well - known enterprise in this field, engaged in offering fine grade AIRWELL ANTI POLLUTION MASK
An exhalation valve is a one way opening valve which allows the hot exhaled air to be released quickly making it comfortable for the user to wear the mask in hot and humid conditions. A valve mask is recommended for those who have an active lifestyle and are engaged into physical activities like running, cycling etc. An exhalation valve is not a filter and it does not offer any filtration properties.