As part of the mask assembly kit, a plastic syringe is included. This syringe is used to inflate and deflate the face mask cushioning for comfort and proper function. Ideally, the face mask cushion only needs to be 2/3 full.
To inflate: First fill the syringe with air from the room (pull the plunger back to fill the chamber with air). Then insert the tip of the syringe into the air port on the front of the face mask. This air port has a valve consisting of a plastic stopper and a small spring. While putting gentle pressure on the air port mechanism, push the air into the face mask cushion. One or two repetitions should inflate the mask properly.
To deflate: Push the syringe plunger all the way down so that the syringe can be used to pull air out. Insert the syringe on the air port mechanism in the same way as stated above, and pull the plunger back to draw air out of the cushion.