If you are experiencing air flow restriction while blowing out the atty, there is either a clog due to gummed up liquid or (this has happened once to me on a TW atty), the insulation in the atty has slide down toward the air holes. If you look at the air holes on the side of the atty and you see white insulation it is the same problem I had and I was unable to remedy the problem. I heard you can use a pin to try and push the insulation back up away from the air holes, but this did not work for me, so I tossed it.