This is a macro photo of filter cap on the "AirCap" we use when dealing with the dusty environment of the pigeon lofts.
Great invention.
You put the cap on which is just a baseball type cap.
It has a face shield and a filter and fan mounted on the top of the cap.
The fan blows filtered air down across your face and out the sides of the faceshield creating a positive pressure under the facemask that prevents non filtered air from entering.
Not advertising but if you are Interested: check it out here: http://www.bradwest.com/
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