Squeeze-type air blowers have become an essential item in an enthusiast's camera bag. Though typical blowers have one little flaw¦ they can ˜inhale' dust and particles and may blow them onto a lens, filter, or sensor. Enter the new PM Clean Air Filtered Blower. It uses a replaceable filter (blocks particles as small as 20 microns) along with some nifty internal valves to ensure ONLY clean air is taken into the body of the blower.